To what does “descent with modification” refer?
a.) All species come from preexisting species and are changed over time.

b.) Some species come from preexisting species but stay basically the same.

c.) Some species come from preexisting species and are changed over time.

d.) All species come from preexisting species but stay basically the same.

Some species come from preexisting species but stay basically the same.

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.