Microscopic plants known as are found near the surface of marine biomes.

Planktons

Explanation:

Microscopic plants known as planktons are found near the surface of marine biomes.

These planktons are producers for all life forms in the marine ecosystem. Without them, other life forms thriving in such biomes would be near impossible.

These planktons are capable of carrying out photosynthesis by which they manufacture their own food from inorganic materials in the environment.

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