The best and most correct answer among the choices provided by the question is the first choice.
We can draw from the experiment that spindle fibers break down at the centrioles.
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The options that are incorrect are A) representation of a complete set of a cell's polypeptides, B) the complete set of an organism's polypeptides, C) the complete set of a species' polypeptides, and D) karyotype, which makes E) the complete set of an organism's genes the correct answer to what defines a genome.
Breathing, moving blood throughout the body, and so forth.