How can allel frequnices change from one gerneration to the next?

Inbreeding, mutation, random genetic drift, migration, extinction, and natural selection all contribute to how allel frequnices can change from generation to generation.

hi,

the answer is third world countries, take for instance china, they restricted each family with only one child,

hope this !

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.