If a branch is cut from a tree , after some hours the stem remains firm explain?

i think the answer would be a. after sentence 14! i hope i at least a little

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 : )