The formation of feathers, hair, and reptilian scales is based on completely different developmental patterns and genetic influences.
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Q33: The IMMEDIATE ancestors of humans (genus Homo)
Q34: Hagfish are craniates but are not vertebrates.
Q35: A hagfish is a not a fish.
Q36: Lampreys' main body support is the notochord,
Q37: Acanthostega is an important fossil for the
Q39: Some dinosaurs had feathers.
Q40: In previous times, birds and pterosaurs were
Q41: The first truly bipedal primates were the
Q42: Our species, Homo sapiens, had been in
Q43: Several species of humans have occurred together
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