Answer:
genetics;the study of heredity and the variation of inherited characteristics.
evolution;evolution is the change in the characteristics of a species over several generations and relies on the process of natural selection
variation;a change or difference in condition, amount, or level, typically with certain limits
Explanation:
Answer:
A
Explanation:
Stretching of the atrium and ventricle muscles
This allows for humans to breed in the same genes and have the same characteristics as the people in their geographic location for example how Asian people share common characteristics with Asian people. But they differ from European people.
