The turkey vulture and the california condor both feed upon animals known as carrion. Neither species of bird has feathers on its head. Explain how natural selection may have played a role in the featherless heads of these carrion eaters.

Ans.

The birds given below are showing a population with different color feathers. These variations are known as genetic variation that involves difference in DNA sequence or genotype between the organisms within a population. Difference in genotype leads to difference in their phenotypic characters (physical appearance).

Thus, the correct answer is option). 'genetic variation.'