What does autotroph mean? A. They can feed themselves through photosynthesis.

B. They eat decaying things.

C. They eat other organisms.

A. They can feed themselves through photosynthesis.

Explanation:

I got it correct

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.