In fruit flies, the gene for red eyes (r) is dominant and the gene for sepia eyes (r) is recessive. if a red-eyed homozygous fly (rr) and a red-eyed heterozygous fly (rr) mate together, what are the possible genotypes of their offspring? (hint: you many want to complete a punnett square.)

a. rr and rr
b. rr only
c. rr and rr
d. rr, rr, and rr

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.

oxygen = 21% of the atmosphere

nitrogen = 78%

carbon dioxide = 0.1%

argon =0.934%