Adenosine triphosphate, or ATP, is primarily used as in living organisms.
O A.
a blood coagulant
O B.
a source of energy
O C.
a reproductive enzyme
O D.
a muscle relaxing hormone

A source of energy

Explanation:

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.

option number one would be youre best option