In what kind of animal material do toxins like mercury concentrate?

Can you please help me.

i believe the answer is c

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.

the answer

b.) bowling ball

answer; ///(a) ;