Question

mitosis is a process by which *
the nucleus is divided into two nuclei
the cell rests
microtubules are assembled
the cytoplasm is divided

Explanation:

Mitosis is a cell division process where the nucleus divides. The first option correctly describes this key aspect. The second option is wrong as mitosis is an active process, not rest. Microtubules are involved but assembling them isn't the main definition. Cytoplasm division is cytokinesis, not mitosis.

Answer:

the nucleus is divided into two nuclei