Natural selection is a mechanism for?

a. Adaptations beneficial in one habitat should generally be beneficial in all other habitats as well.

b. Well-adapted individuals leave more offspring, and thus contribute more to the gene pool, than poorly adapted individuals.

c. Different species that together occupy the same habitat will adapt to that habitat by undergoing the same genetic changes.

d. Natural selection is the sole means by which populations can evolve.

e. Adaptations beneficial at one time should generally be beneficial during all other times as well.