A molecular clock is
A. a clock that uses atoms for accurate time
keeping.
B. an estimate of the rate of accumulation of
genetic divergences between two
populations.
C. a tool used to identify the rate of mutation,
and is the same for all genes.
D. a tool for studying evolution that has no
real-world applications.
B
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inside xylem. Fill in the blank(s) with the appropriate word(s).
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Blocking potassium ion channels in a mammalian cell membrane would __________.
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