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Mutations and sexual reproduction increase genetic variation in a population. Natural selection occurs when environmental pressures favor certain traits that are passed on to offspring. ... Individuals may mutate, but natural selection acts by shifting the characteristics of the population as a whole.
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<h3><u>
Protons & Nucleons</u> are the 2 subatomic particles make up the nucleus of an atom.</h3>
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it regulates blood volume and blood pressure.
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to contract a muscle, myosin and actin filaments shorten, requiring ATP binding and hydrolysis
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