The choice of whether a particular organism belongs to the experimental group or the control group should be based on

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The choice of whether an organism belongs to the experimental or control group should be based on chance, to ensure that there is no bias in assigning organisms to groups. The randomization of organisms into groups helps to eliminate any confounding variables, as the groups should be similar in all characteristics except for the variable being tested.

The Choice of Whether a Particular Organism Belongs to the Experimental