Question

which scenario is least likely to lead to allopatric isolation?
a deep gorge dividing a population of slow - moving snails
a lake dividing a population of butterflies
a mountain dividing a population of desert - dwelling mice
a land bridge dividing a population of tuna
a river dividing a population of small crickets

Explanation:

Allopatric isolation occurs when a physical barrier divides a population. Butterflies can easily fly over a lake, so a lake dividing a butterfly population is least likely to cause allopatric isolation compared to other scenarios where the barriers pose more significant obstacles to the movement of the respective organisms.

Answer:

A lake dividing a population of butterflies