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One of my senior professors used to say that during his school days, in one of their text books, it was mentioned that animals move their upper jaw when chewing
by tgp22 7y ago
One of my senior professors used to say that during his school days, in one of their text books, it was mentioned that animals move their upper jaw when chewing food.
- jdsully 7y agoI suppose it just depends on your frame of reference.