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Explanation:
They allow for many variations to exist in species. That's the answer
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Acid deposition represents the mix of air pollutants that deposit from the atmosphere leading to acidification of soils and freshwaters. ... Rainfall that is acidic, possesses elevated H+ ion concentrations, and has been commonly known as 'acid rain'.
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The rod and cone cells in our eyes are one of our major senses. This is the sense of sight. The taste buds in our tongues are another one of our major senses. This is the sense of taste.