Organisms can be classified in the same species by morphology and

I believe the correct answer would be variation. The definition of variation in biology means, any difference between cells, individual organisms, or groups of organisms of any species caused either by genetic differences or by the effect of environmental factors on the expression of the genetic potentials. So i think that organisms can also be classified as variation. Hope this helped. ♥ ☺

It is used to during sexual reproduction between humans

Bis the