Www. usatestprep. com/modules/questions/99.php?totalQ uestions=10&testid=1740&str and=8685&element=73381&co Before a cell can divide, it must copy its DNA one
at a time in a process called DNA replication
base
sugar
nucleotide
amino acid

Explanation:

Kinda confused with questioning, but imma try!

nucleotides are the building blocks of DNA

base  is made of adenine (A), guanine (G), thymine (T), and cytosine (C).

sugar in DNA is deoxyribose, which has one less hydroxyl group than RNA's ribose

Amino acid the building blocks of life organic are compounds that combine to form proteins.

I hope this sorta helped did a little research bc i was a lil confused, but lmk  if you need anything else in the comments. :)

the answer to your question is:

c. complementary base-pairing

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.