Physical erosion is the process where rocks change their physical properties with out changing there basic chemical components. :8)
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Elion and her colleagues were responsible for developing important drugs.
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I tried my best Answer listed below:
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The primary limitation of economics, Chetty argues, is that economists have a limited ability to run controlled experiments for theoretical macroeconomic conclusions. The high monetary cost and ethical standards make these types of controlled experiments impractical.
