Mammals have two body systems which work together to move oxygen to all parts of the body. Which of the following body systems supply the body with oxygen?

Answers

Answer 1

Answer:respiratory system

Explanation:The primary function of the respiratory system is to deliver oxygen to the cells of the body's tissues and remove carbon dioxide, a cell waste product. The main structures of the human respiratory system are the nasal cavity, the trachea, and lungs

Answer 2

Answer:

the lunges, heart, throat, etc.

Explanation:


Related Questions

A cell has a 1% salt concentration. It is placed into a solution containing a 10% salt concentration.
What will happen to the cell?
Choose 1 answer:

Water will move out of the cell, causing it to swell.

Water will move into the cell, causing it to shrink.

Water will move into the cell, causing it to swell.

Water will move out of the cell, causing it to shrink.

Answers

Answer:

Water will move out of the cell, causing it to shrink.

Explanation:

When something with a low salt concentration is placed in a higher concentration of salt, the salt in the solution will try to suck out the water in the cell. Just remember why we hate salt, because it sucks! There's a little joke to help u remember. Thanks, Ms. Hoj :)

Answer:

CORRECT (SELECTED)

Water will move out of the cell, causing it to shrink.

Explanation:

The cell has lower concentration of solute and a higher concentration of water than the solution it is placed in. This means that water will move out of the cell, causing it to shrink.

Identify the disorders described. immune system overreacts to an antigen part of the immune system does not function properly the body's immune system attacks its healthy cells, mistaking them for pathogens masses of cells form and steal nutrients from healthy cells

Answers

Answer: 1: allergic disorders

2. Immunodeficiency disorders

3. Autoimmune disorders

4. Cancers

Immune system overreacts to an antigen part of the immune system does not function properly the body's immune system attacks its healthy cells, mistaking them for pathogens masses of cells form and steal nutrients from healthy.

What do you mean by Allergy?

Allergy may be defined as a reaction by our immune system to something that does not trouble most other people. It affects a person more specifically.

When a person gets affected by any allergy, the immune system of that person may overreact by producing more antibodies. These antibodies attack the allergen particles and cause adverse symptoms.

A person who has allergies has them because his or her body over reacts to a material that would otherwise be ignored. It is an overreaction of the immune system triggering a immune attack response that is unneeded.

Therefore, a person who has allergies has a compromised immune system because the body's immune system overreacts to an antigen.

Learn more about antigen on:

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PLEASE I NEED HELP IN THIS!! THIS WORKSHEET HAS 50 QUESTIONS BUT I ONLY NEED HELP WITH THESE. DONT JUST TYPE IN A RANDOM ANSWER I NEED A 1-2 BRIEF EXPLANATION FOR EACH TO WHY THEY ARE CORRECT!!
(I NEED HELP WITH 21 QUESTION SECOND PART IS ON MY ACCOUNT)


1. All of the following are true about muscle tissue EXCEPT: *
a) Heart muscles are called cardiac muscles and are not voluntary.
b) Skeletal muscles are usually attached to bones and assist with voluntary movements.
c) There are no striations in smooth muscle which assist with involuntary movement.
d) When a muscles is relaxed, myosin and actin filaments are attached.

2. The development of the male reproductive system occurs in coordination with other human systems. Which of the following is an example of this coordination? *
a) The endocrine system releases the hormone testosterone.
b) The muscular system strengthens the uterine wall.
c) The circulatory system restricts blood flow to the testes.
d) The excretory system removes urea from the blood.

3. How does puberty affect the male and female reproductive systems? *
a) The male reproductive system develops into the female reproductive system during puberty.
b) The male reproductive system produces sperm, where as the female reproductive system produces eggs and nourish a developing embryo
c) The female reproductive system develops during puberty when the thyroid gland releases FSH and LH.
d) The female reproductive system stimulates cells within the ovaries to produce increased amounts of testosterone to start producing egg cells.

4. How does a feedback mechanism regulate the activity of the endocrine system? *
a) A feedback mechanism releases hormones in response to rising levels of other hormones to maintain homeostasis.
b) The endocrine system shuts off when the feedback mechanism shuts off.
c) A feedback mechanism regulates the endocrine system by strengthening the original stimulus.
d) A feedback mechanism changes the external environment to maintain homeostasis.

5. What is the role of neurons in the nervous system? *
a) Neurons heal damaged nerves.
b) Neurons transmit messages in the form of electrical impulses.
c) Neurons are involved in the autonomic nervous system, but not the somatic nervous system.
d) Neurons are the the sodium-potassium pumps involved in the nerve impulse.

6. Environmental management may include which of the following? (Check all the applicable boxes. There may be more than one answer). *
a) Public presentations
b) Field and lab research
c) Oversee projects related to the protection and conservation of natural ecosystems and human health.
d) Consult with businesses and government.

7. Which of the following is NOT an organ of the human male reproductive system? *
a) Testes
b) Vas deferans
c) Urethra
d) Nephron

8. Which of the following is NOT an organ of the human female reproductive system? *
a) Vagina
b) Urinary bladder
c) Ovaries
d) Fallopian tubes

9. Which is the correct order of development? *
a) gastrulation, egg, zygote, eight cell, blastula, morula
b) egg, zygote, morula, eight cell, blastula, gastrulation.
c) egg, zygote, eight cell, morula, blastula, gastrulation
d) zygote, blastula, egg, morula, eight cell, gastrulation

10. Biotechnology careers include all of the following EXCEPT: *
a) Microbiologist
b) Process development scientist
c) Health engineer scientist
d) Biomanufacturing specialist

11. The human brain contains different regions that control specific bodily functions. On a model, how could you identify the region of the brain that is responsible for voluntary activities of the body, intelligence, learning, and judgment? *
a) This region is the thalamus, between the brain stem and the cerebrum.
b) This region is the brain stem, connecting the brain to the spinal cord.
c) This region is the cerebellum, divided into left and right hemispheres.
d) This region is the cerebrum, the largest region in the brain.

12. Forensic science may prove the existence of a crime, the perpetrator of a crime, or a connection to a crime through all of the following EXCEPT: *
a) the testimony of a forensic scientist
b) an attorney's argument
c) administration of tests
d) examination of physical evidence

Answers

Answer:

1. D.

Explanation:

A, B, and C are correct

Myosin is attached to actin filaments when muscles are in motion, not relaxed.

Where are seeds(plant EGGS) found?*
Anther
Ovary
Petal
Filament

Answers

Answer:

Ovary

Explanation:

ANSWER: Ovary

EXPLANATION: The ovary contains ovules (eggs) that become seeds once they are fertilized.

Which of the following is always true of two organisms in
the same taxonomic class?

A.They can breed with one another

B.They have certain physical features in common

C.they evolved at the same time

D.they live in the same ecosystem​

Answers

Answer:

they can breed with one another, they have certain physical features in common, they evolved at the same rate, they live in the same ecosystem. Lions and house cats share common features, but cannot breed with one another.

Explanation:

They share a common ecology, they may breed with one another, share some physical characteristics, evolve at the same rate, and inhabit the same ecosystem, hence option D is correct.

What are the taxonomic classes?

If two species are members of the same class, they are also members of the same higher-level taxon. They share the same phylum and kingdom in this instance.

Kingdom, phylum or division, class, order, family, genus, and species are the seven main taxonomic ranks.

The taxon with the greatest number of species is the kingdom. In taxonomy, it is the broadest category into which the creatures can be divided.

The classification of five kingdoms was made by R.H. Whittaker. The kingdoms of Monera, Protista, Fungi, Plantae, and Animalia are included in this classification.

Therefore, option D is correct.

Learn more about a taxon, here;

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Why is electroreception important to sharks?
O keeps predators away
O detects prey
O balance
O attracts mates​

Answers

Keeps predators away

Which of these is a function of the placenta?
A To deliver the blastocyst after childbirth
B. To carry nutrients to the cells of the uterus
C. To carry wastes away from the embryo
O D. To develop into fetal reproductive tissues

Answers

Answer:

c

Explanation:

write a paragraph to show your knowledge about diabetes that include the following terms:
Glucose, Glucagon, Pancreas, Negative Feedback, Homeostasis, and Liver

Answers

Answer:

Glucose is a simple sugar molecule that helps play a role in high/low blood sugar levels. If your blood level is too low Glucagon is released to increase your blood sugar and if it’s too high Insulin is secreted to lower blood sugar; both Insulin and Glucagon are hormones.This being said these two hormones are secreted by the pancreas. Both of these two hormones are examples of negative feedback leading to a stability In homeostasis. It is regulated by the liver, however if homeostasis is disrupted the body will stop functioning properly leaving no insulin to be produced. Therefore the end result is Diabetes

Alternate forms of a gene having the same position on a pair of chromosomes and affecting the same trait
are called ______. A) phenotypes B) alleles
C) DNA
D) mutations E) genotypes

Answers

Answer:

The answer is B) alleles

Explanation:

Alternate forms of a gene having the same position on a pair of chromosomes and affecting the same trait are called alleles.

What do you mean by traits?

Traits may be defined as the appearance or manifestation of the desired characters. Traits are also known as phenotypes.

Every factor or gene has two alternative copies, one comes from the father and one comes from the mother. These two copies are present in the same location on the homologous chromosome. They are known as alleles of each other.

Therefore, Alternate forms of a gene having the same position on a pair of chromosomes and affecting the same trait are called alleles.

To learn more about Alleles, refer to the link:

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What part of the respiratory tract is considered the respiratory zone?
A. Bronchioles
B. Larynx
C. Trachea
D. Alveoli

Answers

Answer:

D. Alveoli

Explanation:

Functionally, the respiratory system is separated into a conducting zone and respiratory zone:

Conducting zone consists of the nose, pharynx, larynx, trachea, bronchi, and bronchioles. These structures form a continuous passageway for air to move in and out of the lungs.

Respiratory zone is found deep inside the lungs and is made up of the respiratory bronchioles, alveolar ducts, and alveoli. These thin-walled structures allow inhaled oxygen (O2) to diffuse into the lung capillaries in exchange for carbon dioxide (CO2).

The respiratory zone begins where the terminal bronchioles join a respiratory bronchiole, the smallest type of bronchiole, which then leads to an alveolar duct, opening into a cluster of alveoli.

Answer:

Yep, the correct answer is D.) Alveoli

Explanation:

Hope this helped you!Have a great day(:

What geographic feature has the largest impact on creating a climate zone

Answers

i think the answer should be location

Name 5 Dinosaurs Related to Tyrannosaurus rex and Speed also Hight​

Answers

Answer: Spinosaurus Gigantosaurus Allosaurus Tyrannosaurs and Titanosaur.  PLEASE GIVE ME BRAINLIEST

Explanation:  Saurischian Height Length Weight

Acrocanthosaurus (top-spined lizard) 19 ft. 5.8 m 40 ft. 12.2 m 6,000lbs 2,722kg.

Albertosaurus (Alberta lizard) 15 ft. 4.6 m 30 ft. 9.1 m 6,000lbs 2,722kg.

Allosaurus (other lizard) 17 ft. 5.2 m 40 ft. 12.2 m 4,000lbs 1,814kg.

Apatosaurus (deceptive lizard) 15 ft. 4.5 m 75 ft. 22.9 m 66,000lbs 29,937kg.

Archaeopteryx (ancient wing) 1 ft. 0.3 m 3 ft. 0.9 m 2lbs 0.9 kg.

Argentinosaurus (Argentina lizard) 70 ft. 21.4 m 120 ft. 36.6 m 220,000lbs 99,792kg.

Baryonyx (heavy claws) 6 ft. 1.8 m 30 ft. 9.1 m 4,000lbs 1,814kg.

Brachiosaurus (arm lizard) 50 ft. 15.2 m 100 ft. 30.5 m 100,000lbs 45,360kg.

Ceratosaurus (horned lizard) 13 ft. 4.0 m 20 ft. 6.1 m 3,000lbs 1,361kg.

Coelophysis (hollow form) 3 ft. 0.9 m 9 ft. 2.7 m 100lbs 45.5kg.

Compsognathus (elegant jaw) 2 ft. 0.6 m 3 ft. 0.9 m 8lbs 3.6kg.

Deinonychus (terrible claw) 5 ft. 1.5 m 9 ft. 2.7 m 175lbs 80kg.

Diplodocus (double beam) 24 ft. 7.3 m 89 ft. 27.1 m 50,000lbs 22,680kg.

Dromiceiomimus (emu mimic) 5 ft. 1.5 m 11 ft. 3.4 m 220lbs 100kg.

Gallimimus (fowlmimic) 8 ft. 2.4 m 18 ft. 5.5 m 260lbs 118kg.

Mamenchisaurus (Mamenchi lizard) 35 ft. 10.7 m 69 ft. 21.0 m 60,000lbs 27,216kg.

Megalosaurus (big lizard) 12 ft. 3.7 m 26 ft. 7.9 m 2,000lbs 907kg.

Microvenator (small hunter) 2.5 ft0.8 m 4 ft. 1.2 m 14lbs 6.4kg.

Ornithomimus (bird mimic) 8 ft. 2.4 m 15 ft. 4.6 m 300lbs 136kg.

Oviraptor (egg robber) 3 ft. 0.9 m 5 ft. 1.5 m 80lbs 36kg.

Plateosaurus (flat lizard) 7 ft. 2.1 m 26 ft. 7.9 m 4,000lbs 1,814kg.

Saurornithoides (narrow-clawed lizard) 3 ft. 0.9 m 6.5 ft. 2.0 m 60lbs 27kg.

Seismosaurus (tremor lizard) 84 ft. 25.6 m 150 ft. 45.7 m 200,000lbs 90,720kg.

Spinosaurus (spiny lizard) 8 ft. 2.4 m 40 ft. 12.2 m 14,000lbs 6,350kg.

Supersaurus (super lizard) 66 ft. 20.1 m 100 ft. 30.5 m 120,000lbs .54,432kg.

Tyrannosaurus (tyrant lizard) 23 ft. 7.0 m 50 ft. 15.2 m 14,000lbs .6,350kg.

Ultrasauros (ultra lizard) 53 ft. 16.2 m 100 ft. 30.5 m 140,000lbs .63,504kg.

Velociraptor (swift robber) 2 ft. 0.6 m 6 ft. 1.8 m 250lbs .113kg.

   View printable version of table.

Ornithischian Height Length Weight

Ankylosaurus (armored lizard) 7 ft. 2.1 m 35 ft. 10.6 m 10,000lbs 4,536kg.

Camptosaurus (bent lizard) 10 ft. 3.0 m 23 ft. 7.0 m 4,000lbs 1,814kg.

Chasmosaurus (cleft lizard) 6 ft. 1.8 m 17 ft. 5.2 m 3,000lbs 1,361kg.

Claosaurus (broken lizard) 6 ft. 1.8 m 12 ft. 3.7 m 2,000lbs 907kg.

Corythosaurus (helmet lizard) 16 ft. 4.9 m 30 ft. 9.1 m 8,860lbs 4,019kg.

Dravidosaurus (Dravidanadu lizard) 4 ft. 1.2 m 10 ft. 3.0 m 2,000lbs 907kg.

Dryosaurus (oak lizard) 6 ft. 1.8 m 13 ft. 4.0 m 2,000lbs 907kg.

Euoplocephalus (well-armored head) 4 ft. 1.2 m 17 ft. 5.2 m 7,000lbs3,175kg.

Hadrosaurus (bulky lizard) 15 ft. 4.6 m 30 ft. 9.1 m 6,000lbs 2,722kg.

Hypsilophodon (high-crested tooth) 3 ft. 0.9 m 7.5 ft. 2.3 m 140lbs 64kg.

Iguanodon (iguana tooth) 18 ft. 5.5 m 30 ft. 9.1 m 10,000lbs 4,536kg.

Kentrosaurus (spiky lizard) 5 ft. 1.5 m 17 ft. 5.2 m 4,000lbs 1,814kg.

Lambeosaurus (Lamb's lizard) 18 ft. 5.5 m 30 ft. 9.1 m 14,000lbs 6,350kg.

Nodosaurus (node lizard) 6 ft. 1.8 m 18 ft. 5.5 m 6,000lbs 2,722kg.

Ouranosaurus (brave monitor lizard) 10 ft. 3.1 m 23 ft. 7.0 m 8,000lbs 3,629kg.

Pachycephalosaurus (thick-headedlizard) 10 ft. 3.1 m 18 ft. 5.5 m 4,000lbs 1,814kg.

Protoceratops (first horned face) 2 ft. 0.6 m 6 ft. 1.8 m 900lbs 408kg.

Shantungosaurus (Shanshan lizard) 25 ft. 7.6 m 51 ft. 15.5 m 14,000lbs 6,350kg.

Styracosaurus (spiked lizard) 7 ft. 2.1 m 17 ft. 5.2 m 6,000lbs 2,722kg.

Stegosaurus (plated lizard) 11 ft. 3.4 m 30 ft. 9.1 m 6,000lbs 2,722kg.

Tenontosaurus (tendon lizard) 10 ft. 3.0 m 23 ft. 7.0 m 4,000lbs 1,814kg.

Torosaurus (bull lizard) 7 ft. 2.1m 21 ft. 6.4 m 12,000lbs 5,443kg.

Triceratops (three-horned face) 9.5 ft. 2.9 m 26 ft. 7.9 m 14,000lbs 6,350kg.

The above answer is actually very incorrect as it names various species from various different groups and species.

When looking for related species to tyrannosaurus you should look under Tyrannosauridae to get an accurate answer.

Tyrannosaurs Rex - 40-42 ft long, 8.4-14 tons

1. Tarbosaurus - 33-39ft long, 4-5 metric tons

2. Albertosaurus - 30-32ft long, 4 tons

3. Gorgosaurus - 26-30ft, 2.8-2.9 tons

4. Daspletosaurus - 26-30ft, 2.5 tons

5.Zhuchengtyrannus - 33-39ft, 6 tons

Hope this helps. :)

Complete and analyze the Punnett square. R represents round seeds; r represents
wrinkled seeds.

Ratio of phenotypes:
Ratio of genotypes:
Percent of offspring with round seeds:
Percent of offspring with wrinkled seeds:


WILL MARK!!

Answers

Answer:

below

Explanation:

Genotype

RR-25%

Rr-50%

rr-25%

Phenotype

R-75%

r-25%

Percent of offspring with round seeds:75%

Percent of offspring with wrinkled seeds:25%

ASAP WILL GIVE BRAINLIEST
Harry wrote the following examples of homeostasis:

Example 1: An electric blanket provides warmth when it's cold
Example 2: The kidney and other organs remove waste from the human body
Example 3: Some animals migrate to find food
Example 4: Power plants provide electricity for homes


Which of these is a correct example of homeostasis?

Example 1
Example 2
Example 3
Example 4

Answers

It is example 2.

Explanation:

Answer:

B, example 2

Explanation:

I took the test myself I know its right

if you want an answer to a different question on this quiz ask me in the comments.

which of the following definitions is the correct description of symbiosis

Answers

Answer:

A symbiosis is an evolved interaction or close living relationship between organisms from different species, usually with benefits to one or both of the individuals involved.

symbiosis is an evolved interaction or close living relationship between organisms from different species, usually with benefits to one or both of the individuals involved.

Help with this question

Answers

Answer:

Formula

a^2 + b^2 = c^2

a = side of right triangle

b = side of right triangle

c = hypotenuse

Explanation:

PLEASE HELPP. 20 POINTS
Brandy knows that chromosomes behave differently in meiosis and mitosis. What do chromosomes do in meiosis but not in mitosis?


Each chromosome makes a copy.

The homologous chromosomes form pairs.

Chromosomes line up in the middle of the cell.

Chromosomes condense or shorten up before cell division begins.

Answers

Answer:

It's B

Explanation:

"The daughter cells produced by mitosis are identical, whereas the daughter cells produced by meiosis are different because crossing over has occurred. The events that occur in meiosis but   not   mitosis include homologous chromosomes pairing up, crossing over, and lining up along the metaphase plate in tetrads.

Answer:

The homologous chromosomes form pairs.

Explanation:

All living organisms are made up of cells. Cells are the basic units of life. In complex living organisms, cells are organized into tissues, tissues are organized into organs, and organs are organized into organ systems. What characteristic of life does this information represent?
A.
Life tends to be chaotic and random.
B.
Life can be arranged in a structural hierarchy.
C.
Life does not demonstrate order in its systems.
D.
Life is composed of only complex organisms.

Answers

Answer:

C

Explanation:

The answer is B because life can be arranged in a structural hierarchy

S-waves arrive at a seismic station?

First
Second
Third
Fourth

Answers

Answer:

First

Explanation:

S-waves arrive first at a seismic station

What are cilia?
A. false feet
B. skinny tails
C. hairlike projections
D. temporary extensions

Answers

Answer:

c. hairlike projections

Explanation:

it sweeps mucous and dirt out if our lungs.

Hope this helps :)


Which term describes the area of bedrock from which soil forms?

mineral deposit

B horizon

parent rock

A horizon

Answers

Answer:

A

Explanation:

Answer:

A. Horizon describes the area of bedrock from which soil forms.

hope it helps!

What is currently happening with Mount Etna?

Answers

Answer:

As Italy’s National Institute of Geophysics and Volcanology (INGV) explains on a recent blog post, the nascent eruption began on the night of May 29. Starting off by producing a thick column of ash rising from the New Southeast Crater, it gave way on May 30 to a far more lava-heavy display in the area, featuring two fissures blenching out lava.

Answer:

There is currently no eruptive activity at the volcano involving fresh lava and monitoring signals do not suggest an immediate change likely; only a weak thermal anomaly continues to be present from the southeast crater complex.

Explanation:

1pt Which of the following life processes is not necessary for an individual organism to survive, but is necessary for the survival of the species?
A. digestion
B. respiration
C. regulation
D. reproduction

Answers

Answer:

D. reproduction

Explanation:

If the species doesn't reproduce they die out or become extinct.

What is the difference between weather and climate?

Answers

Weather relates to the short term natural occurrences (like rain, storms, sunshine, etc) while climate refers to the long term, general state of a biosphere (like the average temperatures in certain season, how much and how periodically in rains over a long period of time, etc)

Hope this helped.

Science Work, Help Please!

1. A. What is diffusion?

1. B. Use diffusion to
explain what happens when you drop a
sugar cube into a mug of hot tea.

2. A. What is osmosis?

2. B. Describe how water molecules
move through the cell membrane during
osmosis.


Answers

Answer:

Diffusion is the spreading of something more widely. When you drop a sugar cube in hot tea the sugar cube spreads out and the sugar starts to dissolve in the tea. Osmosis is a process by which molecules of a solvent tend to pass through a semipermeable membrane from a less concentrated solution into a more concentrated one, thus equalizing the concentrations on each side of the membrane. If the concentration of water molecules ouside the cell is lower than the concentration of water molecules outside the cell then the water moves out through osmosis. Water travels through the cell membrane.

Diffusion is the movement of particles from a higher concentrated area to a lower concentrated area
Omosis is the movement of solvent particles across a sermipermeable membrane from a dilute solution into a concentrated solution

What percent will have spots ?
25 %
0 %
50

Answers

About 50% will have spots

When iron in rocks reacts with oxygen, it
forms iron oxide (rust), which weakens
rocks and causes them to break apart.
This is an example of...

Answers

Answer:

Oxidation

Explanation:

What is the purpose of the ATP and NADPH produced in the light reactions of photosynthesis?
A. to transfer light energy to excited electrons
B. to stop the electron transport chain
C. to act as carrier proteins in inner mitochondrial membranes
D. to transfer energy to compounds forming three carbon sugars

Answers

Answer: D. to transfer energy to compounds forming three-carbon sugars

Explanation: ATP and NADPH are produced in the light reactions by
when energy absorbed from the sun is conserved as ATP and NADPH. ATP and NADPH generated in the light reactions of photosynthesis are used to synthesize carbohydrates from carbon dioxide and water. The ATP and NADPH are used to reduce CO2 to triose phosphate which can be used to produce glucose. Green plants contain unique enzymatic machinery in their Chloroplasts which catalyzes the conversion of carbon dioxide to simple organic compounds in a process known as CO2 assimilation or carbon fixation. In this carbon fixation reactions, ATP and NADPH is used to drive the incorporation of carbon dioxide into ribulose 1,5-bisphosphate to produce glyceraldehyde 3-phosphate (a 3-carbon sugar) in a series of enzyme catalyzed reactions.

What type of energy transformation takes place when carbon is cycled during cellular respiration?
A) Chemical energy to chemical energy
B) Chemical energy to electrical energy
C) Mechanical energy to chemical energy
D) Mechanical energy to mechanical energy

Answers

Answer:

C

Explanation:

A coal-fired power plant involves these energy transformations: Chemical energy in the coal is converted into thermal energy in the exhaust gases of combustion. Thermal energy of the exhaust gases converted into thermal energy of steam through heat exchange.

А __ is an agent that can cause infections and diseases.

Answers

Explanation:

I think it would be easier if u have options but I will help as much as I know abt this.. so The agents that cause disease fall into five groups: viruses, bacteria, fungi, protozoa, and helminths (worms). Protozoa and worms are usually grouped together as parasites, and are the subject of the discipline of parasitology, whereas viruses, bacteria, and fungi are the subject of microbiology.

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