When a species does not adapt or evolve to change in its environment it will become __.

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

What causes darkening of the skin as melanin production increases

The wings of insects, birds, and bats evolved independently but carry out similar functions. this is an example of a. analogous structures. b. embryonic structures. c. vestigial structures. d. homologous structures.