Euhadra is a species of Japanese land snail in which some have left handed spirals and some have right handed spirals. Snails with right hand shells cannot physically mate with left hand shell snails. Which is the best hypothesis for an isolating barrier between right and left handed species. a. geographical isolationb. temporal isolationc. behavioral isolationd. mechanical isolatione. gametic isolation

d. mechanical isolation

Explanation:

Mechanical isolation is a prezygotic barrier in which there is a physical barrier that prevents two populations of a species from mating successfully as a result of morphological differences.

This reproductive isolation can be seen in the Euhadra species of Japanese land snail, where snails with right hand shells and left hand shells are unable to physically corpulate successfully.