Before the mitosis begins, which happens before the nucleus start to divide?

Before mitosis begins, which happens before the nucleus starts dividing? The cytoplasm separates. The DNA replicates. The sister chromatids separate.

Explanation:

i looked on quizlet it said this

only about ten percent of the energy at one trophic level is passed on to organisms at the next trophic level. the remainder of the energy is used in life processes or lost as heat.

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )