All but one of the statements below describe gene flow. that is

a) it depends on a chance event that changes the gene pool
b) it can reduce the genetic differentiation between the two groups
c) it involves the movement of alleles from one population to another
d) it includes migration or the movement of individuals between population

A) it depends on a chance event that changes the gene pool

air, water, heat and noise pollution can all be caused by producing and using technology. consuming resources - non-renewable resources, including precious metals like gold, are used to make technology

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.