Answer:
P and O₂
Step-by-step explanation:
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Reactants
The substances which participate in a chemical reaction, are called reactants. A chemical reaction describes the process by which atoms, the fundamental building blocks of matter, rearrange themselves to form new combinations. Reactants are raw materials that react with one another.
Also, The substance(s) to the left of the arrow in a chemical equation are called reactants.
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