Question

Which of these is the clearest sign that two populations are different species?(1 point)
Responses

If two populations are adapted to consume different foods, they are different species.
If two populations are adapted to consume different foods, they are different species.

If two populations have significant genetic differences, they are different species.
If two populations have significant genetic differences, they are different species.

If two populations produce only infertile children together, they are different species.
If two populations produce only infertile children together, they are different species.

If two populations live very far from each other and are geographically separated, they are different species.
If two populations live very far from each other and are geographically separated, they are different species.

Answer 1

The clearest sign that two populations are different species is:

**If two populations produce only infertile children together, they are different species.**

This statement aligns with the biological species concept, where species are defined as groups of interbreeding natural populations that are reproductively isolated from other such groups. If two populations can mate but produce only infertile offspring, it indicates that they are reproductively isolated and thus can be considered different species.