What is the difference between a trait and a variation

Species have similar characteristics, but they are rarely, if not never, identical; the difference between them is variation!

Hope this helps! :)

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.

the answer is a) cell division.

hope this !