Question

cell division occurs once. cell division occurs twice. mitosis meiosis

Explanation:

Mitosis is a type of cell division where a single cell divides once to produce two identical daughter cells. Meiosis is a special type of cell division that occurs in sexually - reproducing organisms. It involves two rounds of cell division (meiosis I and meiosis II) to produce four non - identical daughter cells (gametes) with half the number of chromosomes as the parent cell.

Answer:

Cell division occurs once: Mitosis
Cell division occurs twice: Meiosis