Here's how it works:

* Photosynthesis: Plants and some other organisms use sunlight, water, and carbon dioxide to produce their own food (glucose) and oxygen as a byproduct.

* Equation: The simplified chemical equation for photosynthesis is:

6CO₂ (carbon dioxide) + 6H₂O (water) + light energy → C₆H₁₂O₆ (glucose) + 6O₂ (oxygen)

* Oxygen Release: During photosynthesis, water molecules are split, releasing oxygen into the atmosphere. This oxygen is essential for most living things, including humans, who breathe it in for respiration.