Question

the backbone (sides) of dna are made of
a glucose & oxygen
b sugar & atp
c phosphate & water
d sugar & phosphate

Explanation:

DNA (Deoxyribonucleic Acid) has a double - helix structure. The backbone (sides) of the DNA molecule is composed of alternating sugar (deoxyribose) and phosphate groups. This sugar - phosphate backbone provides structural support and stability to the DNA molecule.

Answer:

D. Sugar & phosphate