Answer:
There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA. Mutations themselves are not very common and are usually harmful to a population. Because of this, mutations are usually selected against through evolutionary processes.
Explanation:
The number of years ago at which specie A and B diverge from a common ancestor is 1,000,000 years. Option A is correct.
<h3>What is mitochondrial? </h3>
The mitochondrial is the structure in the cells whose main function is to convert the energy from the food in such a form that the cell can use.
A geneticist was able to reconstruct a sequence of mitochondrial dna of a prehistoric insect that was encased in amber.
A segment of this dna in species <em>A</em> was found to have the sequence AGGTCCTAAG. Species <em>B</em> has the dna sequence AGGTCCGAAG. Thus, the sequence is,
- Species <em>A- </em>AGGTCCTAAG.
- Species <em>B-</em> AGGTCCGAAG.
This segment of dna has had one mutation every 100 million years. The DNA sequence has only one mutation. For this, 100 million year is required.
Thus, the number of years ago at which specie A and B diverge from a common ancestor is 1,000,000 years. Option A is correct.
Learn more about the mitochondrial here;
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According to their system of classification, the Sun is known as a yellow dwarf star. This group of stars are relatively small, containing between 80% and 100% the mass of the Sun. So the Sun is at the higher end of this group.
Answer:
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PSA is Public Service Announcements. Its purpose is to create awareness about a topic of public interest, such as drunk driving and don't txt 'n drive.
look at the PSA pciture n see what its saying.
