A single, quick contraction of skeletal muscle is called a:
a. simple twitch.
b. tetanus.
c. brief contraction.
d. red fiber contraction.
e. white fiber contraction.
A
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Which group of protists consumes CO2 and produces O2 for much of Earth, serving as the base of food webs in lakes, streams, and the oceans?
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Which of these is an electron carrier molecule?
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Which statement about the macronucleus and the micronucleus of ciliates is correct?
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