Erin is studying the rate at which bananas turn brown as part of her science fair project. Her teacher asked her to include a scientific question in the
presentation. Which of the following is a reasonable scientific question for
Erin's project?

the answer is c because it is most logical.

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.