What do you need to have to keep your body in homeostasis on the Moon?

the awnser is d i think

the answer is d (apex) good luck : ))

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

well, i believe that the answer is 2. : 3