how do scientist use fossils, comparative anatomy, and branching diagrams explain the evolution of organisms?

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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.

answer; /// i believe the correct answer is (reactants);