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The onset of puberty in humans is a gradual process occurring over a few years. which of the following controls the onset of puberty? a) the nervous system b) the endocrine system c) the integumentary system d) the excretory system
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Which type of transport is responsible for oxygen entering into blood cells? a. vesicle b. passive c. facilitated d. active b. passive
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What type of cell division is used to replace old cell?
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