What is a substance that forms by joining many small molecules together.

Carbohydrates, proteins, and nucleic acids are built from small molecular units. The small molecular units are called monomers

Explanation:

I'm not really sure if that was what you were looking for, but I remember learning this in biology. I'm sorry if this doesn't help.

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