THE OXYGEN-CARBON DIOXIDE CYCLE.

Oxygen-Carbon Dioxide CycleBoth are GASSES important to all living

things.Unlike water which always stays water,

oxygen (O2) and carbon dioxide (CO2) convert back and forth as they cycle on the planet.

ANIMAL CONTRIBUTION During respiration

(breathing), animals inhale oxygen (O2) and convert it to carbon dioxide (CO2).

PLANT CONTRIBUTION During

photosynthesis (the process where plants make food for themselves) plants breathe in carbon dioxide (CO2) and exhale oxygen (O2).

DECOMPOSERS Dead organic

material contains carbon dioxide (CO2), so as decomposers break down the tissue, carbon dioxide is released into the atmosphere.

FOSSIL FUELS Oil, Gas, Coal are

examples. When these fuels are burned, they release carbon dioxide (CO2) and water (H2O) into the atmosphere.