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.
Answer:
Lactic acid fermentation
Explanation:
When sugars are broken down to energy and lactic acid in animal tissues and in microorganisms it is referred to as lactic acid fermentation. Unlike alcoholic fermentation, lactic acid can be further broken down to release the locked up energy should oxygen be made available.
Answer:
Rocks.
Explanation:
Scientists study rocks from the Precambrian period because isn't really a significant fossil record from the Precambrian.
