Athermometer is taken from an inside room to the outside where the air temperature

answer: i cant find your answer. do u have another way i can answer it for you : )

explanation:

i think the answer is b.

the answers are a and c

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