During mitosis, the nucleus ____. 

A. makes a complete copy of each pair of chromosomes
B. splits and retains one-half of each pair of chromosomes
C. does not make any changes
D. undergoes cytokinesis
E. undergoes two divisions


A. makes a complete copy of each pair of chromosomes
In mitosis, the nucleus makes a complete copy of all 23 of its chromosome pairs.

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