An experiment that is conducted within a controlled environment is known as a controlled experiment, similar to a controlled variable.
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The nucleus<span> maintains the integrity of genes and </span>controls<span> the activities of the </span>cell<span> by regulating gene expression.
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A major disadvantage of artificial classifications is that they have little predictive value; arbitrarily selected properties do not necessarily correlate well with each other. This generally means that they are of little use for purposes other than that for which they were designed.
