I believe it is D. More African elephants today naturally lack tusks compared to the elephant populations 100 years ago, because big game hunters sought elephants for ivory.
Answer:
it is the change in one or more genes
The pig heart is big,and the chicken heart is small.
B. Increased exposure to UV light increases the risk of mutation occurring.
Answer:
During METAPHASE the chromosomes line up along the equatorial plate.
