What could a human living now and a dinosaur living millions of years ago have in common?
A. They have the exact same DNA.
B. They eat the same things.
C. They need the same amount of energy.
D. They have shared matter.

D

Explanation:

answer; ///i believe the correct answer is (aids) acquired immune deficiency syndrome;

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.