<span>Classical conditioning could account for how a child learns to "fear the dark".
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Classical conditioning alludes to a learning system in which a biologically potent stimulus(e.g. sustenance) is combined with a formerly unbiased boost (we can take food as an example). It additionally alludes to the taking in process that outcomes from this matching, through which the neutral stimulus comes to evoke a reaction that is normally like the one inspired by the strong stimulus.
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The Kidneys help the body by filtering waste from foods, medicine, and other toxic substances. They also create hormones that help produce red blood cells and keep blood pressure relatively normal.
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Indigo could be used as dye for people who had no other way to dye their clothes or anything that they want to look pretty.