The oxidation of a chemical occurs when It loses electrons
It gains electrons
It shares electrons
All the above

Oxidation occurs when an atom, molecule, or ion loses one or more electrons in a chemical reaction. When oxidation occurs, the oxidation state of the chemical species increases.

Explanation:

oxidation is loss of electrons

here a trick to remember this

oil rig -> oxidation is loss. reduction is gain

answer by yourhope:

answer is

human impact on the environment can be seen in the deterioration of the !

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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