The majority of a cell's interior is comprised of what?

A cell contains parts such as mitochondria, cytoplasm, nucleus, vacuoles etc.

The majority of cells or every cell has a nucleus which then has nuclear membrane.

So the majority of a cell's interior is nucleus which is comprised of nuclear membrane, nucleolus and nuclei.

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c. the runner should sprint as fast as possible to the finish line.

this would and i think the answer is d