What do all members of the swine species always have in common?

Responses

They always have the same number and kinds of chromosomes.
They always have the same number and kinds of chromosomes.

They always occupy the same position in the food web no matter where they live.
They always occupy the same position in the food web no matter where they live.

They are always preyed upon by the same predators.
They are always preyed upon by the same predators.

They always occupy the same habitat at the same time.

They always have the same number and kinds of chromosomes.