What are three different hypotheses for how Earth accumulated the organic molecules necessary for life to evolve?
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Q17: Humans are
A)heterotrophs.
B)autotrophs.
C)chemoautotrophs.
D)archaeans.
Q18: All the following traits are variable in
Q19: The cyanobacteria were
A)chemoautotrophs.
B)responsible for introducing substantial amounts
Q20: Natural selection may favor traits that help
Q21: When a donkey mates with a horse,
Q23: How do vestigial organs provide evidence of
Q24: Why does natural selection make populations more
Q25: Which of these statements regarding biogeography is
Q26: Two species of insects do not interbreed
Q27: The formation of the isthmus of Panama,
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