Answer:
Radiation and mutations can cause changes in the DNA but there arent substances. Ribonucleic acids can cause errors if they match with the wrong acid.
Answer:
The process will behang in mouth. After that it will go through esophegus. Then it will go to small intenstine. Before going to large intenstine they will take out the needed chemicla substances and then only they will go to large intenstine.
Explanation:
