Alma is walking in a park. Suddenly, a wild dog charges toward her. Alma is frightened. The starts to
respond by increasing her heart rate and dilating her pupils. After running for a few minutes, Alma realizes that the dog has fallen far
behind. At this point, her
starts working to relax her body by slowing down her heart rate and
constricting her pupils.

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

ok yes, but what is the question? as soon as you ask the actual question i will answer it. : )