Animals that are warm-blooded, have body hair, and produce milk for their young are grouped in the class A. Amphibia. B. Mammalia. C. Aves. O D. Reptilia.

B. Mammalia, mammals all share these features but the platypus, who lays eggs instead of giving birth to live young.

one comes through sex and the other does not lul im not

an adaptation is a change or process by which an organism takes to be better suited for its environment. for example; migration is a behavioral adaptation, this is needed because birds are not built to last extremely cold climates. there are different adaptations because there are different species needing to adjust to different things, bears don't migrate; they hibernate.