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In general, characteristics that an organism survive and reproduce become more common over time. what mechanism of evolution causes this?
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Explain the physiological changes that occur when the hypothalamus stimulates the sympathetic nervous system. you can make a flowchart or a simple step process. be sure to include all chemicals/hormones secreted, glands involved and the functions of each chemical/hormone.
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Explain how sperm are able to reach an egg to fertilize it....
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