Why Reproduction is necessary for the survival of a species on this earth?

Reproduction is vital to the success of a species. For a species to survive it must be able to produce more offspring than it loses though old age, disease, and predation.

Explanation:

Living things can reproduce in different ways – asexual reproduction and sexual reproduction.

Hope it helps.

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