Answer: Cleavage furrow.
- A Cell plate formation
- B Cleavage furrow
- C Cell wall formation
- D Spindle disappearance
Correct answer: B. Cleavage furrow
Explanation: In animal cells, a cleavage furrow forms and pinches the cell in two. Plant cells form a cell plate from the inside out.
The cell cycle: G1 (growth and preparation), S (DNA replication, chromosome number stays 2n but DNA content doubles), G2 (final checks before division), and M (mitosis itself) - together, G1+S+G2 make up interphase.
Concept context
Mitosis and meiosis: how cells divide for growth, repair, and reproduction.