Question

A scientist researching salamanders has obtained two different specimens. Under what conditions would he classify them as belonging to different species?

Answer 1

The answer is  D) The two salamanders cannot mate a produce fertile offspring.

Answer 2

This is the condition under which he would classify them as belonging to different species - the two salamanders cannot mate to produce a fertile offspring. If these two lizards belonged to the same species, they would normally be able to breed and give birth to a fertile new "child." However, given that they are not of the same species, they cannot do such a thing, which is why this scientist classified them that way.