If two organisms possess similar structures that serve similar functions but don't possess a common ancestor that shared that structure, then the structures are classified as
a. vestigial.
b. morphologies.
c. analogous.
d. homologous.

C. Analogous

Explanation:

For example, the wings of a fly, a moth, and a bird are analogous because they developed independently as adaptations to a common function—flying.

Analogous organ.

Explanation:

Analogous organ may be defined as the organs that have similar structure and function but not share a common function. This type of organ shows convergent evolution.

Analogous organs are opposite to the homologous organ. For example: Wings of bats, insects and birds have similar structure and function but does not have a common ancestor, they are analogous organ.

Thus, the correct answer is option (C).

the answers are a and c

yes, because even though a theory has a  lot of evidence to support it, it is not always true