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otez555 [7]
3 years ago
6

The phanerozoic eon is divided into three eras. What are they

Biology
1 answer:
Aleonysh [2.5K]3 years ago
3 0
1- Paleozoic era
2- mesozoic era
3- Cenozoic era
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Vacuoles are found in plats, animals, and single-celled organisms.
alex41 [277]

Answer: c

Explanation: because it helps by excreting

4 0
2 years ago
Elephant seals are abundant in their population size but they have low genetic diversity within their species due to overhunting
Anastasy [175]
<h2>Genetic diversity </h2>

Explanation:

If the environment changes, the species runs the risk of not having the genetic diversity to be adaptable to that change and could go extinct

  • Genetic diversity is the diversity  or genetic variability within species
  • The huge variety of different gene sets defines an individual or a whole population's ability to tolerate stress from any given environmental factor
  • While some individuals might be able to tolerate an increased load of pollutants in their environment, others carrying different genes might suffer from infertility or even die under the exact same environmental conditions;the former will continue to live in the environment the latter will either have to leave it or die
  • Any change in the environment - natural or human induced causes a selection of events that only the fittest survive
  • In case of elephant seals,overhunting reduces the sum of genes available,thus leaving behind a population that is less capable of tolerating any further natural or human disturbances in environment
  • The loss of genetic diversity within a species can result in the loss of useful and desirable traits  
8 0
3 years ago
A massive bluegill fish kill was observed in a lake near a power plant during the winter months. It was determined that the plan
Savatey [412]

Answer:

Option B

Explanation:

Option D is incorrect, as increased photosynthesis would increase oxygen supply present, not carbon dioxide supply.

Option C is incorrect, as increased decomposition would increase carbon dioxide released and oxygen present is reduced, not increased.

Option A is unlikely as if this were the case, increased oxygen levels would enable bluegill fish to survive as well.

8 0
3 years ago
How has genetic research changed our government?
Sati [7]

Answer:

Several ways really.

Explanation:

It has changed how the government views laws to do with abortion, put in new laws to do with how we can change ourselves or our children, etc. etc. There are a lot more to do with the laws behind it, but the government has also been researching how to use genetics in the army and things like that.

I hope this can give you a start on it!

8 0
3 years ago
Deletion of a DNA base from a gene affects an organism by—
sergiy2304 [10]

Answer:

Deletion of a DNA base from a gene affects an organism by changing the sequence of amino acids in a protein.

Explanation:

A DNA fragment forms a gene, with a specific sequence of nitrogenous bases, which determines the synthesis of a specific protein. When a deletion of a base occurs in such a gene, it affects:

  • Transcription of the mRNA, which will have the sequence of altered bases.
  • During translation, the mRNA codons will encode at least one different amino acid.
  • The structure of the synthesized protein, which will be altered by changes in its amino acid sequence.

In summary, the <u>deletion of a base in the DNA</u><u> will affect the </u><u>protein</u><u> to be synthesized by </u><u>changing the amino acid sequence</u><u> of its structure</u>.

The other options are not possible, because the deletion of a base in the DNA of a gene

<em>     Does not influence the number of chromosomes that the gametes will have. </em>

<em>     It does not produce long chains in the chromosomes. </em>

<em>     It does not affect the ribose structure of the nucleic acids.</em>

8 0
3 years ago
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