Fact 1: Cells are programmed to divide only a set number of times. Fact 2: Apoptosis is programed cell death. Given the two facts above, what kicks in after a certain number of divisions?

Choices: i. Energy.. ii. antibiotics. iii. Energy. iv. separation. v. nerves. vi. apoptosis. vii. soccer leagues. viii. Plants growth.
Answer:
vi.