The best and most correct answer among the choices provided by the question is the second choice "progression"
<span>This principal refers to continually increasing the demands on the musculoskeletal system in order to continually make gains in muscle size.</span>
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Every cell has got different sets of genes. Although they do have the same exact DNA. The set of genes expressed in a cell determines the set of proteins and functional RNAs it contains, giving it its unique properties.
