Which would be the most useful source of evidence to support mcneill's contention?

answer; i believe the correct answer is (a)0

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.

colors do exist. the color of the sky is actually violet; humans percieve the color of the sky as blue.