According to the natural history of disease model, the time before the precursors of disease and the host interact is called the period of:

the answer is d (apex) good luck : ))

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.

voluntary muscles are controlled by the cerebellum.