Question

if two populations of the same species of insects have been geographically isolated from each other for an extended period of time, they will most likely exhibit

a. different traits that allow each to better survive in its particular environment

b. increased rates of genetic mutation

c. evolution into two different species that can mate and interbreed

d. very few differences in terms of appearance

Explanation:

Geographic isolation can lead to different selective pressures in each environment. Over time, natural selection acts on each population. Traits that are beneficial in one environment (e.g., camouflage in a forest - like environment vs. in a grass - land environment) will be favored. This results in different traits evolving in each population to better suit their specific habitats.
Genetic mutation rates are not directly increased by geographic isolation. If two populations evolve into different species, they cannot mate and interbreed (by the biological species concept). And since they are in different environments with different selective pressures, there will be more than very few differences in appearance.

Answer:

A. different traits that allow each to better survive in its particular environment