In nature, there are some organisms that are unable to perform aerobic respiration in the presence of oxygen. What would be the possible reason(s) behind this phenomenon?

answer; i believe the answer is (polygenic inheritance;

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 : )