Which of the following happens during prophase? a. the cell cytoplasm divides b. the nuclear membrane breaks down c. the chromatids attach to the spindle d. the sister chromatids are pulled apart.

 B. The nuclear membrane breaks down, during prophase. 

Prophase is the first phase of mitosis and this is also the process that the duplicated genetic material separates. They are carried into the nuclei of the two identical daughter cells. Thus, the answer to this item is letter B. The nuclear membrane breaks down. 

That is true! many fish species traveled to the u.s. because of it.

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