Answer:
True.
Explanation:
Extinction vortex is a model used by scientists to understand extinction dynamics within a community. This model allows scientists to assess and understand how a population can become highly vulnerable to elements of its habitat, becoming increasingly apt for extinction. According to this model, any organism is capable of extinction, as all are susceptible to having a gene pool that will not allow its survival, regardless of the environment.
Erosion and deposition constantly change Earth’s surface. Erosion carries natural materials like rock and soil from one place to another. Through deposition, these natural materials may be deposited in areas where they build up over time.
Which landform results from the deposition of materials in a valley during volcanic eruptions?
A.sill
B.mud pot
C.caldera
D.lava plateau
(Science)
Which statement is true?
A.Peat is a fossil fuel because rewetting it takes only 3–5 years.
B.Peat is a fossil fuel because the total time for restoration is lengthy.
C.Peat is not a fossil fuel because it has biologic origins, making it a biofuel.
D.Peat is not a fossil fuel because humans can promote the replenishment of peat.
Peat is not a fossil fuel because humans can promote the replenishment of peat is a correct statement.
What do you mean by Fossil fuels?Fossil fuels may be defined as fuels that are derived from decomposed plants and animals. It includes coal, petroleum, oil, and natural gases.
Peat is considered forgotten fossil fuel because through the activity of humans it may be replenished into other forms for different use. It may maximum takes 3-5 years for rewetting.
Therefore, the true statement is Peat is not a fossil fuel because humans can promote the replenishment of peat.
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what is the function of neurotransmitters?
neurotransmitters are often reffered to as the body's chemical messangers. They are the molecules used by the nervus system to transmit messages between neurones, or from neurones to muscles. Communication between two neurones happens in the synaptic cleft (the small gap between the synapses of neurones).
How many cranial nerves is it?
Explanation:
there are 12 cranial nerves
Which of the following sentences uses commas correctly? Carol was the last person out of the house wasn't, she? Carol was the last person, out of the house wasn't she? Carol was the last person out of the house, wasn't she? Carol, was the last person out of the house wasn't she?
Answer:
The third sentence......................
Explanation:
The correct sentence is Carol was the last person out of the house, wasn't she?
Why is a comma important?Commas help your reader figure out which words go together in a sentence and which parts of your sentences are most important. Using commas incorrectly may confuse the reader, signal ignorance of writing rules, or indicate carelessness.
What are the Rules of commas?Comma Rules
Use a comma after an introductory phrase or clause. Use commas before and after a parenthetical phrase or clause. Use a comma to separate two independent clauses linked by a coordinating conjunction (and, but, for, nor or, so, yet) Use a comma to separate items in a series.Learn more about the use of commas here https://brainly.com/question/2251561
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How old is the sun?
Our little teenage Sun is nearly 4.6 billion years old.
In a certain population, the allele causing sickle cell anemia has a frequency of 0.2. If the population is in genetic equilibrium for this allele, what fraction of the population would be heterozygous for this gene
Answer:
32% population would be heterozygous for this gene.
Explanation:
Due to technical problems, you will find the complete explanation in the attached files
Which of the following is a disadvantage of geothermal energy?
Answer:
B
Explanation:
The collection process of geothermal energy itself creates large amounts of pollution which damages the environment - especially toxicity in water.
Answer:
B. Collecting it damages the environment.
g 20. Name two bones connected by an interosseous membrane found in the crus and/or sural region. Which one is the medial bone
Answer:
Tibia and fibula. Tibia (medial bone)
Explanation:
The tibia is the medial bone of the lower leg (it is the second-largest bone next to the femur), whereas the fibula is the lateral bone of the lower leg. The tibia functions to transmit the majority of the force in the lower leg. The tibia articulates at the proximal end with the femur and fibula; where this bone (tibia) articulates at the distal end with the fibula and the talus bone of the ankle. The tibia and fibula are connected via an interosseous membrane, which is a thin sheet of connective tissue that spans the space between two bones.
Most streams result from _____.
a. altitude
b. melted snow
c. oceans
d. rivers
Answer:
....b........ melted snow
which is more vulnerable to disturbances, a simple food web with only a few species or a more complex one
Answer:
few species
Explanation:
in a complex one im not sure as to how the question measures complexity but a complex one may have more options and more things to adapt to
A scientist is tracking an object orbiting the Sun that is found between Mars and Jupiter. Which additional feature can
be used to determine the object is an asteroid?
O produces a coma
O has an irregular shape
O has a tail of ice and dust
O produces a streak of light
Answer:
The correct answer is actually B. Has an irregular shape.
1. What features are located medial to the cranium and the mandible. Identify the category here.
2. How many individual items are included in this category?
2. There is a total of six individual items in this category.
The human skull is made up of two parts, the cranium, which contains the face and the brain and the only movable bone called the mandible or lower jaw.
The features that are medial to the cranium and the mandible are those structures that are nearer to the mid-line.
The above mentioned features works together to provide the following functions of the cranium:
protection of the delicate structures including the brain, eye and the inner ear.maintaining patency of the nasal passage enabling breathing.the movement of the mandible allows chewing.Learn more here:
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2. What is the percentage likelihood that the couple will have a child that has the allele for cystic fibrosis
Answer:
the answer I got for the question you asked is 75%
Describe how table salt dissolves in water in 300 words.
Answer:
salt disloves in 300 words
Answer:
Salt (sodium chloride) is made from positive sodium ions bonded to negative chloride ions. Water can dissolve salt because the positive part of water molecules attracts the negative chloride ions and the negative part of water molecules attracts the positive sodium ions.
Explanation:
When sodium chloride is dissolved in water, the polar water molecules are able to work their way in between the individual ions in the lattice. The water molecules surround the negative chloride ions and positive sodium ions and pull them away into the solution. This process is called dissociation.
Unlike other plants, trees are plants living for several years thus they are
A. Annual
B.shade
C.perennial
D. Fence
The genetic code is defined degenerate or even redundant because:
A. the same codon codes for different amino acids
B. an amino acid can be encoded by several codons
C is different in all organisms, except in monozygotic twins
D. the sequence of codons is not separated by intervals, but is continuous
E. the structure of the genes is constantly mutating
Answer:
B. an amino acid can be encoded by several codons
Explanation:
The genetic code refers to the set of rules that govern how the four nitrogenous bases (A,U,G,C) is arranged to form amino acids. The genetic code is a collection of all the CODONS formed. There are different characteristics of the genetic code and one of them is its REDUNDANCY.
Since there are 4 nitrogenous bases combined in three's to form a codon i.e. 4³, there are 64 possible codons that could form 20 maximum amino acids. This means that there are more codons in relation to amino acids. Hence, more than one codon can encode an amino acid, and this is referred to as REDUNDANCY of the genetic code.
For example, LEUCINE amino acid is encoded by 6 codons as follows: UUA, UUG, CUU, CUC, CUA, CUG.
number of chiasmata during the stage of diakinesis:
a) increases
b) decreases
c) remains the same
d) there is no kiazma
Explain the answer
Answer:
a because it harm the people
Prokaryotes and eukaryotes are similar in all of these aspects except
A. having all four types of macromolecules.
B. the size of their cells.
C. having at least one cell.
D. the presence of DNA
Answer:
D its D its D its D ddddddddddddddddd
Fill in the blanks: Antibodies are produced by _______________________________________ and bind to specific ________________________________ on erythrocytes, causing ________________________________, or clumping of erythrocytes.
Answer:
Antibodies are produced by _white cells__ and bind to specific _antigens_ on erythrocytes, causing __agglutination__, or clumping of erythrocytes.
Explanation:
Macrophages are one of the different types of cells that intervene in the organism's defense system against strange substances and pathogen agents. These cells are the principal actors in the immune response.
Macrophages have several functions. They are the principal phagocytes of tissues, capable of recognizing different strange molecules that penetrate the organism, such as bacterias, parasites and, viruses. Macrophages phagocyte these substances and eliminate them, a process known as phagocytosis. When macrophages are activated, they release cytokines that favor inflammation response, which is used to neutralize the pathogen agent. When macrophages phagocyte strange substances, they show the antigens in their surfaces to be recognized by lymphocytes.
Antigens are defined as the strange substances that enter the organism and trigger a series of cellular events that produce defense mechanisms. Antibodies recognize antigens as invaders.
In the organism, there are leucocytes or lymphocytes (white cells) in charge of immune defense. These are B cells, which produce antibodies, and T cells that can destroy infected cells from the body. They all circulate in the blood.
Antibodies are globular proteins produced by lymphocytes in response to the presence of strange molecules. Each type of antibody recognizes and combines with a particular antigen, immobilizing it. After that, the antigen is destroyed by other components of the immune system.
an ion is formed when an atom
Answer:
The basic unit of the chemical elements
how digestion happens in human
Explanation:
The muscles of the small intestine mix food with digestive juices from the pancreas, liver, and intestine, and push the mixture forward for further digestion. The walls of the small intestine absorb water and the digested nutrients into your bloodstream.
Answer :Once foods are broken into small enough parts, your body can absorb and move the nutrients to where they are needed. Your large intestine absorbs water, and the waste products of digestion become stool. Nerves and hormones help control the digestive process.
There is a Y chromosome gene in humans that has two alleles influencing hair growth on the pinna (external ear). One allele causes very hairy ears. The phenotypic effect of the other allele is to not have hairy ears. A man with hairy ears and a woman without hairy ears are starting a family. What is the probability their first child will be a girl with hairy ears
Answer:
Since the gene is located on the Y chromosome, and the Y chromosome is absent in females, the probability their first child will be a girl with hairy ears is zero
Explanation:
Y-linkage, also known as holandric inheritance is a form of sex linkage in which inherited traits in offsprings are produced by genes located on the Y chromosome. The Y chromosome is one of the sex-determining chromosomes and is present only in males. Males have a copy of the Y chromosome and an X chromosome while females have two copies of the X chromosome.
For a trait that is linked to the Ychromosome, the phenotypic effect occurs only in males and is always manifested in these males. Since the Y chromosome is absent in females, the character and its phenotypic effect are absent from daughters of trait carriers. Therefore, all daughters will be normal.
Since the gene for hair growth onnthe pinna is located on the Y chromosome, and the Y chromosome is absent in females, the probability their first child will be a girl with hairy ears is zero.
The probability that their first child will be a girl with hairy ears is zero.
The sex chromosomes in humans are the X and Y chromosomes. They determine the sex of a baby and also carry the sex linked traits. A baby girl results from XX and a baby boy results from XY.
We are told that this gene for hairy ears is located on the Y chromosome. This chromosome is absent in a girl child. hence, the probability that their first child will be a girl with hairy ears is zero.
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Afferont neurons
a.transmit sensory input to the CNS
b.are multipolar neurons
c.have many dendrites and a single long axon
d.are found only within the brain and spinal cord
Answer:
a.transmit sensory input to the CNS
Explanation:
Afferent neurons will take input from your muscles, skin etc. and send it to your CNS (usually via spinal nerves).
which property has not been observed for membrane proteins being degraded for energy during biological pathways
Answer:
energy storage
Explanation:
Membrane proteins are proteins that are either form part of or interact with cell membranes. Based on their interactions, membrane proteins can be categorized into integral proteins, which are a permanent part of a cell membrane, and peripheral proteins, which adhere temporarily to the cell membrane. Membrane proteins play many critical functions, for example, 1-they are involved in the passive and active transport of substances across cell membranes, 2-act as enzymes that catalyze chemical reactions, 3-act as receptors that bind specific molecules (such as hormones or neurotransmitters) in order to activate signaling cascades, 4-mediate communication between cells, 5-provide a mechanical link between the extracellular matrix and the cytoskeleton, etc.
A penicillin reaction is a life-threatening event. In those who are allergic to penicillin, the drug acts as a __________ that binds to blood proteins, causing a strong immune response.
Answer:
A penicillin reaction is a life-threatening event. In those who are allergic to penicillin, the drug acts as a hapten that binds to blood proteins, causing a strong immune response.
Explanation:
Low molecular weight chemicals can bind to antibodies, but cannot activate B lymphocytes by themselves (they are not immunogenic). To generate specific antibodies to these small chemicals, immunologists typically bind them to macromolecules prior to immunization. In these cases, the chemical is called a hapten. Penicillin G is a typical hapten that tends to covalently bind to lysine residues both in solution and in protein-bound cells. Penicillin is a drug that behaves as a hapten, since the beta-lactam ring under physiological conditions opens and reacts with the lysine residues of proteins, forming a complex that is the main antigenic determinant of penicillin and other beta-lactams and is capable of to stimulate responses mediated by antibodies or by T cells.
Predict what will happen to the concentration of pyruvate, NADH and H+ when the Krebs cycle is stopped by arsenic
Answer: Pyruvate would increase, NADH would decrease, and intermembrane H+ would decrease as well.
Explanation:
Glycolysis would raise pyruvate, but the Krebs Cycle would not produce NADH, decreasing it. No protons (H+) will be pushed into the intermembrane gap, lowering its H+ content and raising its pH.
What is Kreb's cycle?The tricarboxylic acid (TCA) cycle, commonly referred to as the Krebs cycle or the citric acid cycle, is the primary route that cells use in order to acquire energy and is an essential component of aerobic respiration. The cycle transforms the oxidative potential of acetyl coenzyme A (acetyl CoA) into the reductive potential of nicotinamide adenine dinucleotide (NADH).
The synthesis of ATP via the Krebs cycle is disrupted when arsenic is present because it prevents pyruvate from being converted into acetyl coenzyme A (acetyl-CoA). In addition to the effects described above, arsenic also prevents glucose uptake at the cellular level, as well as gluconeogenesis, the oxidation of fatty acids, and additional acetyl-CoA formation.
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Write an experiment to show that sunlight is necessary for photosynthesis.
Answer:
Explanationwe have two or three plants, they both get the same water every day they both get the same amount of soil and fertilizer, one is without sunlight and one is with, after a 2 weeks our results will be found
hope this helps
sexually produced offspring are indentical to their parent . true or false ?
3. A bacterial isolate from a urine specimen was grown in culture, Gram stained, and then tested for its ability to ferment sugars and hydrolyze various subtrates. What approach to bacterial identification is this an example of
Answer:
Phenotypic approach for bacterial identification
Explanation:
Bacterial identification can be done by conventional methods, which are based on phenotypical characteristics. These methods are much affordable and reasonable.
Phenotypical identification is based on bacteria´s observable characteristics, such as their morphology, development, and biochemical/metabolic properties.
It is important to consider that these methods do not provide absolute certainty. They can only indicate the genera or species to which the bacteria under study may belong.
Some primary evidence is usually used for fast bacteria identification:
Gram staining, morphology, growth at different media or different incubation atmospheres, glucose fermentation, spores production, motion, aerobiosis/anaerobiosis, among others.Knowing that the bacteria in the exposed example was isolated and grown in culture, then Gram-stained and tested for biochemical reaction, we can assume that the approach for its identification is phenotypic.
