the first seismic waves to reach seismograph stations move in a push-and-pull motion. they are called
love waves
secondary waves
primary waves
surface waves
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they are called primary waves

<3

Explanation:

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.