1. Carbon- Oxygen Cycle

2. Problem: What is Carbon- Oxygen Cycle? Hypothesis: It has two basic life processes involved. These are respiration and photosynthesis.

3. Photosynthesis R Respiration Oxygen in air Carbon Dioxide in Air

4. During photosynthesis, plants absorb carbon dioxide from the air and use it to produce food. In the process, they release oxygen.

5. The process where plants release oxygen and take in carbon dioxide from animals and people is called TRANSPIRATION.

6. Most organisms take in oxygen from the air and use it to break down food during respiration. They obtain energy and release carbon dioxide during this process.

7. RESPIRATIONis the process by which people and animals take in oxygen from plants.

8. Atmospheric carbon dioxide is the principal carbon source of living matter. When organisms die, decomposers break down the carbon compounds in their bodies and release carbon dioxide. Sometimes the bodies of dead organisms don’t decompose but are compressed underground for thousands of year. Note that the carbon dioxide content of air is also increases through combustion of industrial fuels, through forest fires and other burning processes, and to some extent also through occasional expulsion of heat from the interior of earth such as in volcanic eruptions.

9. Members: Jayson Ardenio Kris Marco Barcinas Mark Edison Bautista Beatrice Mae Abella Ihna Marie Bangoy Mara Hazel Batuegas GildanelBelesario LaurichelleBunag Group I II- Star