Do teeth cause a chemical reaction to take place? Explain your answer.

Biologically speaking, during the process of digestion where teeth are mostly involved, teeth carry out chewing which is rather a mechanical reaction

So my final answer is No

the sugar-phosphate backbone forms the structural framework of nucleic acids, including dna and rna. this backbone is composed of alternating sugar and phosphate groups, and defines directionality of the molecule.

the answer would be..

b. sucking