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

oceans

indian ocean

pacific ocean

atlantic ocean

arctic ocean

southern ocean

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d