Is it true or false that photosynthesis is a chemical reaction?

The answer is true. Photosynthesis is a chemical reaction.

A chemical reaction happens when a substance react with other substances to change into new substances, which are completely different than the original substance in both their physical and chemical properties.

Looking in the equation of photosynthesis,

carbon dioxide + water → glucose + oxygen

Glucose (a type of sugar) and oxygen are completely different substances comparing to carbon dioxide and water, thus photosynthesis is a chemical reaction, where plant uses sunlight to make food (glucose) from carbon dioxide and water (absorbed from air and soil).

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smooth muscle is composed of involuntary muscles found within the walls of organs and structures such as the esophagus, stomach, intestines, and blood vessels. those muscles push materials like food or blood through organs. unlike skeletal muscle, smooth muscle can never be under your control.