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[Video]
If Dave's a human [and not an animal that someone's named] then the biggest differences are size and that Dave is bipedal and has hands.
[He's not being intentionally contrary, he's just thinking differently.]
If you call humans people but not animals and plants, then what do you call humans, plants, and animals together?
[He at least recognizes that one of the problems here is that they have different meanings for words.]