Photosynthesis uses energy from the sun, water, and Carbon Dioxide to make food, in the form of a sugar called glucose. The process also makes oxygen that animals, including humans, and other organisms can use to breath.
Photosynthasis and Respiration are going on all the time. Plants take carbon dioxide from the air and give off oxygen. Animals, and other organisms, use oxygen and give off carbon dioxide. This is show below.
Cell Cycle: Cells Reproduce, Grow and Develop
Cells Divide because:
1) Repair: Cells have a limited life and need to be replaced with newer ones
2) Growth: As an organism grows it needs more cells.
Cells make a copy of themselves, or divide in a process called mitosis.
Cancer is a disease in which cells multiply out of control, over and over, destoying healthy tissue