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what happens during prophase?
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a. chromosomes condense, and mitotic spindles form.
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b. chromosomes are copied, and the nuclear membrane disappears.
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c. spindle fibers pull the sister chromatids apart,
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d. nuclear membranes form around two sets of chromosomes.
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During Prophase chromosomes condense, and mitotic spindle form, chromosomes are copied, and the nuclear membrane disappears, spindle fibres pull the sister chromatids apart.

Explanation:

Prophase is divided into 2 sub-phases as early Prophase and late prophase.

Early Prophase:

In early prophase distinct thick chromosome like structures, Centrioles move to the opposite poles and, nuclear membrane disappears

By late prophase:

Astral rays and spindle fibres are formed. Spindle fibres attach to the chromosome. Contractions occur in the attachment and sister chromatids are pull apart towards the equator.

Metaphase will follow the prophase.

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

name and explain one of the event that occurs during meiosis that increases the variation in offspring even more than simple reproduction?