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When a scientific experiment is carried out in a controlled setting, all variables are kept the same except for the C. experimental. Experimental variables are the things you are studying in the experiment and it is the only variable you can change.
According to sources, the most probable answer to this query is electron transport chain is a step in cellular respiration that is responsible for producing the energy currency of the cell, ATP.
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The answer is A. When a potent drug is discovered, it has to undergo animal and human trials to test it ADMET (Absorption, Distribution Metabolism, Excretion, and Toxicity) properties. Using tissue cultures to test drugs, such as cancer drugs, prevents the incidence of subjecting humans to the unknown adverse effects of the drugs before the drugs are determined to be safe for use.
Because water is a polar molecule, it makes an excellent solvent for polar and ionic compounds found within cells and tissues.