Different mating habits cause two groups within a population to be less likely to mate with each other. as a result, reproductive isolation occurs between the two groups. what does this cause?

speciation

Explanation:

Reproductive isolation is the existence of barrier that limits breeding or reproduction among organisms living in the same environment. These barriers can be mechanical, behavioral, physiological, genetic, etc.

Reproductive isolation process can be pre-zygotic or post zygotic. While the later act after fertilization, the former prevents fertilization from occuring.

Organisms that are reproductively isolated evolve along different path and eventually become different species.

digestion

it excretes wastes