Question

what does evolution most help explain?
a. why some species survive and others become extinct
b. how different species adapted to their natural environments
c. why only some members of a species have helpful adaptations
d. how species develop from common ancestors and diversify

Explanation:

Step1: Analyze Option A

Evolution theory includes natural selection. Species with traits suitable for environment survive (e.g., giraffes with long necks for food), while those without (e.g., some dinosaurs) may go extinct.

Step2: Analyze Option B

Evolution explains adaptation. For example, polar bears' white fur (camouflage in snow), thick fat (insulation) - result of evolutionary processes to fit arctic environment.

Step3: Analyze Option C

Genetic variation (not evolution's main explanatory focus for "only some members") causes some members to have helpful adaptations. Mutation creates new alleles, random process.

Step4: Analyze Option D

Evolutionary theory (like Darwin's) shows common descent. Fossil records (e.g., homologous structures in vertebrates) and genetic similarities prove species develop from common ancestors and diversify.

Answer:

A. why some species survive and others become extinct, B. how different species adapted to their natural environments, D. how species develop from common ancestors and diversify