
Laboratory experiments suggest that many of the kinds of organic molecules needed to form the first forms of life could have been made nonbiologically in Earth's early history.
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Q50: The amniotic egg first appeared in which
Q51: The amniotic egg was important in the
Q52: Modern birds are probably direct descendants of:
A)marsupials.
B)iguanas.
C)dinosaurs.
D)crocodiles.
Q53: Which of the following would support a
Q54: The first vertebrates to develop jaws were
Q56: Both gymnosperms and angiosperms may be pollinated
Q57: The earliest evidence of life on Earth
Q58: Primates first appear in the fossil record
Q59: Some of the more advanced organisms in
Q60: The metabolism-first model suggests that a self-replicating
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