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For a normal person, about how long does a cycle of sleep (from stage 1 to stage 4 and back again) last?
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Acceleration is a direct result of a.) balanced forces b.) unbalanced forces c.) gravity d.) velocity hurry!
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2points what do bacteria have in common with the cells of other living organisms?
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For a normal person, about how long does a cycle of sleep (from stage 1 to stage 4 and back again) l...
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