Water cycle is the cycle that H2O molecules go through. The nitrogen cycle is the cycle that nitrogen goes through as it changes from nitrate to nitrite to ammonia, all by bacterias in the soil.
Fish live their whole lives in the water. Some fish lay eggs. Other fish are born live. A frog is an amphibian. It starts its life in the water and then moves onto land when it becomes an adult.
cancer cell cycle is different because they multiply faster than a normal cell and when they multiply fast there is alot of mistakes with them normal cells take a while before they are developed