Answer:
The nuclear envelope does not disappear in metaphase of mitosis, because it already did in prophase. ... The nuclear envelope needs to be broken apart so that the chromosomes can be found, aligned in the middle of the cell, and then pulled apart.
Explanation:
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I think b.only select generation are effective...
It keeps the reactor core, and cools the steam.
The food that is undigested and fails to break down becomes stool because it can not be used.