Is species singular or plural?

Question

can i say

when a species loses its variation, it's about to die out

Answer 1

Although Genera has plurality of Species,but biologically the species is singular in itself.

Answer 2

It is both the singular term and the plural (like "sheep").

So you have one species, and many species.

Answer 3

i think it would be plural, it is pertaining to more than one.