Ascrew has 4 threads per centimeter and a circumference of 2 centimeters. the mechanical advantage of the screw is

8.

Explanation:

depends where

on my head

yes

on my legs

yes

on my

arms

yesh

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.