The major way that meiosis ii differs from mitosis is that

yes its like the dead sea which is full of salt which makes you stay afloat

so yes an egg will float in salt

one would be wind another would be water density

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.