Quick < 33
a marine food chain means like a food chain of all the animals underwater, right?

Yes, like on land humans are at the top of the food chain and the rest of the animals on land trickles down from there. Yet the only difference with a marine food chain is instead of land animals and humans the food chain consists of fish,sharks, and other water dwelling animals.
Hope this helped!! 

3. is true i think i should be right