Populations of dinoflagellates are being affected by global climate change, causing concerns about increased red tides and coral bleaching. On the other hand, a related group of protists, the diatoms, play an important role to slow global warming by

Sequestering carbon from the atmosphere to the ocean floor.

Explanation:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

fumikage isn't really a bird, and tsuyu does have teeth. tsuyu has a transformation quirk which still allows her to be partially human. otherwise we'd have a large frog running around. fumikage has teeth because again, he isn't a bird. his head was a quirk mixture if i'm correct.