There are three sources of genetic variation: mutation, gene flow, and sexual reproduction. A mutation is simply a change in the DNA.
When the upper water layers warm in the summer months, they become separated from deep water by a transition zone known as a thermocline. In a thermocline, the temperature decreases rapidly with small increases in depth. This phenomenon linking temperature change with depth is called temperature stratification.
The answer is option A)cyclins
Answer:
DNA and protein
Explanation:
two biomolecules are most often
analyzed to establish homologies between
different species are DNA and proteins
