Achemical reaction is the change that takes place when or more substances interact to form new substances.

The answer is: Two.

Explanation:

A chemical reaction, also called chemical change or chemical phenomenon, is any thermodynamic process in which two or more substances, called reactants or reagents, are transformed, changing their molecular structure and their bonds, into other substances called products.

The answer is: Two.

plants need sunlight, water, and carbon dioxide to make food. plants use the raw materials of water, nutrients they absorb from soil, and carbon dioxide to make sugars the plant can use. energy from the sun and chlorophyll are also needed.