An animal has many legs, a very hard exoskeleton, and lives underwater. It is most likely
an insect
an arachnid
a crustacean
a sponge
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answer///systemic;

answerconditioned response;

i believe your answer would be phagocytosis

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 : )