Fossils of marine organisms high in the Andes mountains led Darwin to which of these conclusions A. Earth is 6,000 years old
B. An earthquake had taken place
C. Great change can happen over time
D. Interspecific variation had taken place

this might

phosphorus cycle

explanation:

the phosphorus cycle is the way that compounds of the element phosphorus, an essential nutrient, are recycled in the environment. plants absorb phosphorus compounds from the soil, and decaying organic matter, including both plant matter and animal droppings, returns it to the soil. phosphorus is a vital part of atp, the energy currency of all cells, and is vital to all forms of life.