Which u. s. government agency ensures that federal laws protecting human health and the environment are enforced fairly and effectively?
department of the interior
environmental protection agency
national science foundation

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.

the answer is d p: cell, q: organ, r: organ system, s: tissue

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.