Answer:
Amphibians
Explanation:
They had just shown up during the Carboniferous period and were still living in the water.
Answer: zooplankton, small nekton
Explanation:
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.
Explanation:
Crop rotation methods in the use of legumes.