Gases, like oxygen and carbon dioxide, move across cell membranes using simple diffusion. When ions can pass through the membrane without the aid of other molecules, and since oxygen and carbon dioxide can pass through the membrane, it is known as simple diffusion.
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The long part of a nerve cell along which the electrical signal quickly moves.
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Negative growth rate is when a population's average number of deaths is greater than its average number of births. Zero growth rate is when the average number of deaths equals the average number of births.
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