How does the creation of a new mountain range in an ecosystem affect an animal population that becomes divided into two groups by the mountains?

Over time the two groups of animals with evolve different features that are suitable in their environments and eventually won’t be able to mate with each other at all.

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.

i think a) betsy can donate only blood to mark is correct because, mark and betsy have the same blood type. whereas nobody else has b+ blood so betsy can't donate to them.