Which of these activities is mot related to the muscular system? Secretion of hormones from glands

The mechanical grinding of the stomach as it digests food

running up a hill

lifting a heavy boy into a table

c

explanation:

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.

it's false. hope i .