"a family can save over 50,000 gallons of water per year by recycling greywater" the most reliable source of this information is a1) plumber2) scientific website3) salesman4) journalist

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.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.