All pure substances (1 point) *

a. contain only one type of atom

b. can be broken down into simpler substances

c. cannot be broken down into simpler compositions

d. have a fixed composition

the denominator has a very specific role.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.

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.