Mercury is found in a food chain. Which organism would have the highest concentration? a
A. Bacteria
O B. Shrimp
O C. Algae
O D. Shark

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.

i'd have to say the answer is probable the second option "the geosphere interacting with the atmosphere"

they are known as evergreens