Answer:
The correct answer is prophase.
Explanation:
Prophase is the first stage of the M-phase that is mitosis and meiosis. In this stage chromatin condenses into chromosomes followed by the nuclear envelope breaks down. This is the first stage where chromosomes are visible. Â Centriole separation takes place after the nuclear envelope breaks down, and a formation of spindle initiate in prophase.
Thus, the correct answer is prophase.
