Two patchwork fish are crossed

plato users

given bodies of water

pacific / arctic / indian / southern

[ a ] the caribbean sea

[ b ] the northern ocean

[ c ] the atlantic ocean

[ d ] the barents sea

with this being the given answers

answer: substrate concentration. enzymes work best when there is a high enough substrate concentration for the reaction they catalyse.

c. heat from the poles back down towards the equator.