Are responsible for the structures and functions of organisms

it enhances antibody production by t cells of the adaptive immune system.

hope i'm right

explanation:

hydrogen is a compound or a single element and a element is a pure substence that cannot be separated into simpler subtances

clorine is a compound its a chemical substance that forms when two or more different elements combine

so both hydrogen and clorine are compounds

geologic time scale (for gradpoint) =)

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves