How do human beings contribute to the phosphorus and sulfur cycles?

the answer is simple its adding chemical fertilizers to the soil

Explanation:

Humans can alter the phosphorus  cycle in many ways, including in the cutting of tropical rain forests and through the use of agricultural fertilizers. Crops often cannot absorb all of the fertilizer in the soils, causing excess fertilizer runoff and increasing phosphate levels in rivers and other bodies of water.

the element that provides strength to the exoskeletons of clams and oysters is phosphorus. this is so because calcium carbonate is the main component in the shells.

explanation:

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.