Except sexual selection usually affects one sex, not both. And the extra bone doesn’t make the jaw stronger, it makes it weaker.
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Cake day: November 29th, 2023
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Yes. Humans have chins, which make jaws weaker. Chins are useless extra bone and essentially a structural defect, but not bad enough for evolution to do anything about.
Source is I heard it somewhere and of course now I can’t find it. :/