If a cell normally has 12 chromosomes how many chromosomes will be present if ach cell at the end of meiosis 2 if a single pair of homologous chromosomes fail to separate at anaphase 1

D. Two daughter cells will each have five chromosomes and two daughter cells will each have seven chromosomes.

If a single pair of homologous chromosomes fail to separate at anaphase 1, then that pair will end in one of the cell. At the end of the cycle there will be 1 cell with 5 chromosomes and one cell with 7  chromosomes.

Those cell will be divided again, resulting two of similar cells with haploid chromosome

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.