Photosynthesis is an example of an endothermic reaction. Photosynthesis works by turning water and CO2 into glucose (C6H12O6) and oxygen. Photosynthesis gets its energy from the sun. Also, it gets its carbon dioxide and water from other living things and nature. Because it uses the sun's energy, not producing it, makes this an endothermic reaction. It happens everywhere around the world, where there are plants and algae.
This is the most important reaction on Earth. It helps people breath and eat. When plants take in CO2, they also release O2, which helps us breath and stay alive. Plants also produce glucose, which gives the plants and other living things energy. Without these 2 things, living things wouldn't survive.
http://commons.wikimedia.org/wiki/File:Photosynthesis.gif http://www.biology4kids.com/files/plants_photosynthesis.html
