HeLp. "How many times does a person's heart beat in their life? How many gallons of blood does it pump? (Estimate that the heart pumps 50 3 of blood in each beat, you should take as a reference its beats per minute and an average life of 70 years)"

it should be briana that has it to me

answer///unconditioned stimulus;

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.