The nucleus is what during phase 2

Prometaphase

Explanation:

Prometaphase is the second phase of mitosis, the process that separates the duplicated genetic material carried in the nucleus of a parent cell into two identical daughter cells. During prometaphase, the physical barrier that encloses the nucleus, called the nuclear envelope, breaks down.

it takes hundreds of years to become stable.

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d. planting trees

the trees take in carbon to make oxygen.