Biology

The correct answer is: B.Growth factors

Explanation:

Growth factors are molecules that promote cell cycle progression. They bind to receptors on the cell surface, activating signaling pathways that encourage cells to move through the cell cycle phases (G1, S, G2, M). This stimulation is essential for cell division and tissue growth.

Why the other options are incorrect:

A.Lack of nutrients: Lack of nutrients typically halts the cell cycle. Without adequate...