Animals that get energy by eating the carcasses of other animals that have been killed by predators or have died of natural causes are called

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

if you know your abc's you should be able to get your answer or just use google