Answer:
atmosphere
Explanation:
Which statement about the DNA double helix is true?
-It allows for fully conservative replication.
-The double helix is made up of a single, continuous strand of DNA.
-The two strands are antiparallel.
-Adenine and cytosine pair together, and guanine and thymine pair together.
The Endangered Species Act protects individual species by
a.
reducing biodiversity.
b.
forbidding harm to exotic species.
c.
forbidding harm to endangered species.
d.
developing recovery programs for exotic species.
I need help answers these questions?
warm fronts appear on weather maps in areas of
Answer:
On a weather map, a warm front is usually drawn using a solid red line with half circles pointing in the direction of the cold air that will be replaced. Warm fronts usually move from southwest to northeast. ... A cold front is the transition area where a mass of cold air moves in to replace a mass of warm air.
Explanation:
Answer:Which object is created during the formation of a star?
a nebula
a protostar
a supergiant
a supernova
Explanation:
As a cell grows larger and increases in volume, which of the following effects on its surface ratio is most likely
A. it's surface area increases, but not as rapidly as it's volume increases
B. it's surface area remains constant
C. the surface area decreases
D. it's surface area increases more rapidly than it's volume increases
Answer:
D
Explanation:
Larger organism increases more in volume than area. That's why larger organism uses respiratory systems or organs and systems instead of simple diffusion for removal of waste and absorption of nutrients.
What happens to food after a snail eats it?
Answer:
They Digest The Food
Explanation:
Instead of being chewed, the radula scrapes the food and breaks it, before it passes through the esophagus to continue the digestion process.
The Environmental Policy Act of 1969 was instituted as a follow up regulation to major environmental issues that occurred in
the 1960's.
Please select the best answer from the choices provided
T f
Answer:
The given statement is true.
Explanation:
The enactment of the Environmental Policy Act or the EPA in 1969 was done to monitor the issues of the environment that took place in the 1960s. It was the major and the primary law, which was postulated at that time to solve environmental issues in the United States. The enactment of the EPA law was done for various reasons, some of which are as follows:
1. To better the health of human beings.
2. To generate harmony between nature and humans.
3. To encourage efforts to reduce destruction to the environment.
Answer:
true ).
Explanation: answer on edge
Can u guys please help me , I really need help
Answer:
"Protists" So it is Eukarya
A biogeochemical cycle is a pathway for chemicals necessary for life to move through the environment.
true
false
Answer:
True
Explanation:
Biogeochemical cycle is a pathway for chemicals necessary for life to move through the environment.
Your body is composed of oxygen, carbon, hydrogen, nitrogen, calcium, and phosphorus. Most of these elements go through different biogeochemical cycles to move through the environment to you or from you to the environment.
Different finch species have beaks of different shapes and sizes. What do these beak differences tell us?
Answer:
Differences in beak shapes tell us that all the finches eat the same type of food. Different finch beak shapes are evidence that all Galápagos finches shared a common ancestor a long time ago. Different finch beak shapes are evidence that over time, finch species adapted to different food sources on the islands.
Explanation:
4- Jamie does an experiment. She charges a pencil by rubbing it with a piece
of silk. Jamie finds that she can use the pencil to attract the silk. Why does
the attraction occur?
Answer:
More info given below.
Explanation:
This attraction occurs as a result of static charge. You see an atom is referred to as the smallest particle of a substance; and when an atom gains or looses electrons it becomes unstable creating a difference in potential. However in this case rubbing induces friction which induces heat. This heat excites the atom to loose electrons creating a negative charge on the silk and a converse positive charge on the pencil.
Wild birds follow herds of zebras and feed off the bugs that are in the zebra's fur. This helps the zebras because the bugs can carry disease. It is helpful to the birds because the bugs are their main source of food. What kind of relationship do the zebras & the birds have?
A. commensalism
B. parasitism
C. mutualism
D. predation
E. competition
A lifestyle change that can help conserve energy is A. Using incandescent lights B. Using less of any resource C. Buying the cheapest gas D. Both (A) and (B)
Answer: I would say D
Explanation: Because the cheapest stuff aren't the best item you want but the expensive one so D is my choice both A and B.
A scientist is observing an organism under the microscope. The organism was found in salt water, is multicellular, and its cells do not have nuclei. What is most likely true about the organism based on this information?
Answer:
I think the options should be:
It is a protist because it is microscopic.
It is not a protist because its cells do not have nuclei.
It is not a protist because it is multicellular.
It is a protist because it is found in salt water.
If correct, then the answer is option B
Explanation:
The above information about the organism can confirm that the organism is not a protist because it does not possess nuclei. It could be a prokaryote but these are not multicellular but can only be under the condition that maybe each prokaryotic cell aggregates and exist as a colony.
Answer:
the answer is its a protis bc its microscopic .
Explanation:
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Alicia created a physical model to show how one of the human body systems works. She first adds sand and pebbles to a glass of water. Then, she uses filters to separate the solids from the water.
Which organ(s) serve(s) a similar function in the human body?
A) the heart
B) the glands
C) the kidneys
D) the stomach
Answer:
(c) the kidneys
Explanation:
Your kidneys remove wastes and extra fluid from your body, basically filtering fluids
Sodium ions are used by your body every time you move a muscle. Determine the difference between the sodium ion and the sodium atom by using the model below.
Answer:
Sodium Atom is an element in its original state and Sodium ion is that on an excited state
Explanation:
Sodium Ion is a Soduim atom that has lost one electron.
The diagram represents a food web in a marine ecosystem which statement best describes the role of two populations within this food web?
A: Phytoplankton and cod are both producers.
B: phytoplankton and zooplankton are both producers.
C: zooplankton are producers, and phytoplankton are consumers.
D: phytoplankton are producers, and cod are consumers.
Answer:
i think it's b
Answer: D.) phytoplankton are producers, and cod are consumers.
Explanation:
A.) is wrong because cod are consumers, not producers
B.) is wrong because zooplankton are consumers too
C.) phytoplankton are producers, and zooplankton are consumers instead.
Hoped I helped a bit! :)
this is the condition in which one living organism serves as a food source for another
Answer:
Producer
Explanation:
A producer provides food for other organisms and a consumer is an organism that eats the producer.
Please help! if you don't know the answer just don't answer or you will get reported.
1. Describe one observation that supports the theory that mitochondria and chloroplasts originated as independent prokaryotic organisms
2.Explain how a symbiotic relationship like the one described in the endosymbiotic theory would have benefited each cell.
Answer: hope the below answers will help
Explanation:
1 and 2 in this paragraph
SKILLS TO DEVELOP
Briefly describe what is meant by the endosymbiotic theory.
Give some evidence supporting the theory that mitochondria and chloroplasts may have arisen from prokaryotic organisms.
It is thought that life arose on earth around four billion years ago. The endosymbiotic theory states that some of the organelles in today's eukaryotic cells were once prokaryotic microbes. In this theory, the first eukaryotic cell was probably an amoeba-like cell that got nutrients by phagocytosis and contained a nucleus that formed when a piece of the cytoplasmic membrane pinched off around the chromosomes. Some of these amoeba-like organisms ingested prokaryotic cells that then survived within the organism and developed a symbiotic relationship. Mitochondria formed when bacteria capable of aerobic respiration were ingested; chloroplasts formed when photosynthetic bacteria were ingested. They eventually lost their cell wall and much of their DNA because they were not of benefit within the host cell. Mitochondria and chloroplasts cannot grow outside their host cell.
Evidence for this is based on the following:
Chloroplasts are the same size as prokaryotic cells, divide by binary fission, and, like bacteria, have Fts proteins at their division plane. The mitochondria are the same size as prokaryotic cells, divide by binary fission, and the mitochondria of some protists have Fts homologs at their division plane.
Mitochondria and chloroplasts have their own DNA that is circular, not linear.
Mitochondria and chloroplasts have their own ribosomes that have 30S and 50S subunits, not 40S and 60S.
Several more primitive eukaryotic microbes, such as Giardia and Trichomonas have a nuclear membrane but no mitochondria.
Although evidence is less convincing, it is also possible that flagella and cilia may have come from spirochetes.
Figure 7.8.1 : One model for the origin of mitochondria and plastids. This model has an amitochondriate eukaryote engulfing an aerobe and then a cyanobacterium. Image used with permission from Kelvinsong
EXAMPLE 7.8.1
Briefly describe what is meant by the endosymbiotic theory.
Give three points of evidence supporting the theory that mitochondria and chloroplasts may have arisen from prokaryotic organisms.
Solutions
The endosymbiotic theory states that some of the organelles in eukaryotic cells were once prokaryotic microbes.
Mitochondria and chloroplasts are the same size as prokaryotic cells and divide by binary fission.
Mitochondria and chloroplasts have their own DNA which is circular, not linear.
Mitochondria and chloroplasts have their own ribosomes which have 30S and 50S subunits, not 40S and 60S.
Summary
The endosymbiotic theory states that mitochondria and chlopoplasts in today's eukaryotic cells were once separate prokaryotic microbes.
Contributors
Dr. Gary Kaiser (COMMUNITY COLLEGE OF BALTIMORE COUNTY, CATONSVILLE CAMPUS)
Put the steps of the carbon cycle in order using Step 1 as your starting point. Step 1: Carbon dioxide is
taken in by plants during photosynthesis.
The cycle repeats when the carbon stored in the atmosphere as carbon dioxide gas is
taken in
The animal releases the carbon dioxide back into the atmosphere during respiration.
The animal eats a plant and uses its carbohydrates for energy.
DONE
Answer:
step four
step three
step two
Explanation:
Which functions are aided by swimmerets in crustaceans? Check all that apply. attachment to host gas exchange prey capture reproduction swimming
Answer:
b,d,e
Explanation:
I took the assignment.
The functions that are aided by swimmerets in crustaceans are gas exchange, reproduction, and swimming.
What do you mean by Crustaceans?Crustaceans may be defined as any of a large group of mostly water animals, that have tough outer shells, two pairs of antennae, and limbs that are jointed.
Crustaceans are organisms that belong to aquatic habitats where play performs their functional role and increase their survival rate effectively.
Therefore, the functions that are aided by swimmerets in crustaceans are gas exchange, reproduction, and swimming.
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The Immune System is built on millions of cells called
Answer:
White blood cells: lymphocytes, neutrophils, and monocytes
Explanation:
Lymphocytes are processed in the bone marrow and then migrate to the lymphoid organs. The cells of the immune system are white blood cells: lymphocytes, neutrophils, and monocytes.
The immune system comprises of many biological structures and processes within an organism that provides resistance to infection and toxins.
HELP MEEEE
How can scientists investigate the impact of limiting factors on a population?
Answer: No population can increase without limitation. Instead, populations in natural ecosystems increase or decrease in response to the changes in the factors that restrict growth. Many factors influence population densities and growth, and these factors may lead to oscillations in population size over time. It is also often difficult to determine the exact factor limiting growth. Many different factors may combine to produce unexpected results.
Explanation: I hope this helps....
Answer:
Limiting factors include a low food supply and lack of space. Limiting factors can lower birth rates, increase death rates, or lead to emigration. Limiting factors determine the carrying capacity of a population.
what is the change in size of a group of organisms of the same species over time
A) population growth
B) death rate
C) birth rate
D) immigration and emigration
The chart shows information about three different embryos early in their development.
Which is best supported by the information in the chart?
Species X and Y are not related to humans.
Species Y and Z are not related to humans.
Species X and Z are related to humans.
Species X and Y are related to humans.
Answer:
Species X and Y are related to humans.
Explanation:
The chart shows information about three different embryos early in their development. The best supported by the information in the chart is that Species X and Y are related to humans. Thus, option D is correct.
What is an embryo?An embryo refers to the early development stage with respect to the multicellular organism. The organism should be again produced se-xually. Moreover, the development of embryonic should be a portion of the life cycle just done after fertilization and continued via when the structure of the body is formed like tissues and organs.
The development of embryonic i.e. used for proof with respect to evolution should be related species that contain the same embroys.The similarities during the embryo stage of development among different animals are due to the expression of ancient genes.
These ancient genes have the same evolutionary origin, thereby they are homo-logous sequences. For example, fish embryos and human embryos express certain homo-logous genes in the embryos stage, thereby leading to the development of gill slit during this stage.
Therefore,Thus, option D is correct.
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An active transport process by which a vesicle moves a large substance out of the cell is known as __________.
osmosis
endocytosis
exocytosis
diffusion
Answer:
I'm pretty sure it is exocytosis. Because exocytosis transports vesicles out of the cell through the plasma membrane. Remember it as "exo" = exit.
Answer:
C. Exocytosis
Explanation:
The first thing we notice is that the question says "active transport". Looking at the answer choices, we see that "osmosis" and "diffusion" are options.
However, remember that osmosis (the diffusion of water from high to low concentration) and diffusion (the movement of particles from high to low concentration) are both passive transport; in other words, they don't require an input of energy. So eliminate them.
Now look at endocytosis and exocytosis. "Endo" means "inner", so "endocytosis" means the cell is engulfing a substance and bringing it inside. However, we want the process where a substance is moved out.
"Exo" means "out", so "exocytosis" means to expel something. That matches here, so our answer is C.
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What does the nucleus of the cell contain?
Answer:
DNA
Explanation:
I need help like ASAP
Which of the following did NOT investigate genetics through studying the structure of DNA?
Gregor Mendel
Rosalind Franklin
James Watson
Francis Crick
Answer:
Gregor Mendel
Explanation:
He did not study the structure of DNA.
Which statement is the best description of respiration?A. Respiration is the same thing as inhaling and exhaling oxygen.B. Respiration is the process of breathing in oxygen through the lungs.C. Respiration is the exchange of oxygen and carbon dioxide in the alveoli.D. Respiration includes inhaling, exhaling, and reactions in cells using oxygen.
this is the best description
respiration is the process in which oxygen is inhaled for the breaking down of glucose(food) in the cells and carbon dioxide is exhaled
What portion of the nervous system controls digestion?
Select one:
O a. Cerebellum
O b. Brain Stem
O c. Spinal Cord
O d. Peripheral System
Answer:
C. Spinal Cord controls the digestion
Explanation:
Spinal Cord is the portion of the nervous system controls digestion. Thus, option C is correct.
What is brain?
The part the nervous system that contains the cerebrum and cerebellum is the brain. The brain is an organ in the body that controls different other activities in the body. Almost everything in the body is controlled by the brain. The three main parts of the brain is; cerebrum, cerebellum, brainstem. The cerebrum controls speech and emotion, the cerebellum controls movement and the brainstem controls sneezing, coughing.
Spinal cord is a part of the nervous system transports information between the brain and other parts of the body. The spinal cord is a tubular and thin structure composed of nervous tissue. The spinal cord functions are to the transmission of neural signals among the brain and other parts of the body. Spinal Cord is necessary because the brain communicates with the body through it.
Thus, the brain sends information by the spinal cord to the peripheral nerves everywhere to the body that serves to regulate the muscles and inner organs.
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