Which pair of characteristics would you use to place a fish in one of the three fish classes: agnatha, cartilaginous fishes, or bony fishes?

The pair of characteristics that you would use to place a fish in one of the three fish classes: agnatha, cartilaginous fishes, or bony fishes is by skeleton type and skin covering. The correct answer choice is:

A) skeleton type and skin covering.

I hope this helps, Regards.

answer; i believe the answer is (polygenic inheritance;