ANSWER AND I'LL MARK U BRAINLIST

C

Explanation:

as they are both tube shaped and part of gastrointestinal tract. esophagus is 25 cm and small intestine is 152.4cm

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.

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.