Why do animals and humans need proteins in their diet? 1. They need these proteins to incorporate directly into required tissues
2. They break down protein into amino acids needed for their particular protein synthesis
3. They cannot make their own protein
4. They need protein for cell energy

for  example, forests have higher evapotranspiration than other ecosystems,  such  as grasslands, because of their deeper roots and greater leaf area. thus forests have a net moistening effect on the atmosphere and become a moisture source for downwind ecosystems.

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.