Abat wing, an alligator leg, and a human arm are homologous structures. which fact about those structures best supports one aspect of theory of evolution

The correct answer is descent from a common ancestor.

Explanation:

Homologous structures are the structure which is similar in appearance but perform different functions in a different organism.

The wing of a bat, leg of an alligator and arm of a human, they all look similar in appearance with same type and number of bones but they all perform different functions in them.

The same type and number of bones show that they all have come from the same structure of the last common ancestor or their ancestor was common. This type of evolution is called divergence evolution and provides a piece of evidence to the theory of evolution given by Charles Darwin that "all species arises from same ancient common ancestor also called descent from a common ancestor". This proves that the evolutionary history of life forms a branching tree.

Thus, descent from a common ancestor is the correct answer.

the answer is d. chordata