Scientists at Arizona State University sequenced SARS-CoV-2 genomes collected from hundreds of infected individuals. They found a deletion of 81 base pairs in some of the viruses. This large deletion is in a gene that codes for a protein that helps the virus escape the immune system. Predict how the frequency of viruses with this deletion will change in the population over time. Use evidence to support your answer.

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

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 c.) there is a warm front in region a and a stationary front in region b.