Answer:
During active transport, substances move against the concentration gradient, from an area of low concentration to an area of high concentration. This process is “active” because it requires the use of energy (usually in the form of ATP). It is the opposite of passive transport.
Explanation:
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C) a system is a set of parts that function together as a whole
<span>A to recycle carbon dioxide in the atmosphere</span>
Hurricane Katrina was a density-dependent factor because this disaster affected everyone in the area. It did not selectively have an effect like
