What type of Boundary is this?

the correct answer, according to e2020, is the second choice there is an occluded front in region a and a cold front in region b.

huh

explanation:

i think i can answer even without the example. over time with environmental changes, sometimes a group of animals will adapt to better survive. take a moth for example. if the trees the moths use to camouflage themselves from predators, started to die or change colors themselves, the moths may, overtime of course, change color too. its just adapting to its surroundings. hope i was of any : )