Question

which statement must be true of their individuals if two populations are no longer the same species?
they do not share any of the same space.
they do not have any of the same genes.
they do not resemble each other at all.
they cannot reproduce successfully with each other.

Explanation:

According to the biological species concept, a species is a group of individuals that can interbreed and produce fertile offspring. If two populations are no longer the same species, they cannot reproduce successfully with each other.

Answer:

They cannot reproduce successfully with each other.