<span>D. they take hundreds to thousands o years to complete a cycle</span>
Rivers usually empty into oceans. Any pollution deposited or pick-up by the river, will eventually end up in the ocean.
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energy transfers from your finger to the ice cube
<span>Stabilizing selection is at work in this case. This is the force that allows a population to gradually center on a mean value due to a presence of a non-extreme bodily trait. The more extreme examples of the trait lead to the organisms being selected out, and the trait that is the least conspicuous wins out in the long-run.</span>
