LIFE SCIENCE

Detailed explanation-1: -Allopatric speciation occurs when a geographical barrier, like a river, mountain, or canyon, separates members of a population. This barrier prevents the individuals on one side from reproducing with the individuals on the other.

Detailed explanation-2: -Geographical isolation means the separation of species by physical barriers like water forms, oceans, mountains, etc. The organisms are ultimately separated from exchanging genetic material with other organisms of the same species.

Detailed explanation-3: -Prezygotic barriers prevent members of different species from mating to produce a zygote, a single-celled embryo. Some example scenarios are below: Two species might prefer different habitats and thus be unlikely to encounter one another. This is called habitat isolation.