Answer:
Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor. hope this helps
Explanation:
The source of the oxygen released into the air as a product of photosynthesis is C) Water only.
Vein because they have valves to prevent back flow of blood.
