Organisms play an important role in the carbon cycle in the following ways: Plants absorb carbon from the environment in photosynthesis and return it in respiration. Animals obtain their carbon by eating plants; they release carbon in respiration.Plants absorb carbon dioxide during photosynthesis and much of this carbon dioxide is then stored in roots, permafrost, grasslands, and forests. Plants and the soil then release carbon dioxide when they decay. Other organisms also release carbon dioxide as they live and die. There are six main processes in the carbon cycle: photosynthesis, respiration, exchange, sedimentation, extraction, and combustion. Most of these deal with carbon in the form of CO2. In photosynthesis energy produced by the Sun is transported to the Earth where it is consumed by primary producers such as plants. The carbon cycle describes the process in which carbon atoms continually travel from the atmosphere to the Earth and then back into the atmosphere. Since our planet and its atmosphere form a closed environment, the amount of carbon in this system does not change. Plants and animals are linked to each other through the carbon dioxide and oxygen cycle. Plants produce oxygen, a gas that animals and other living things need. Animals and other living things produce carbon dioxide, a gas that plants need to make their own food. The atmospheric carbon dioxide can be converted to organic material in the process of photosynthesis. Hence, the formed carbon dioxide is released back into the atmosphere through respiration, and carbon dioxide reaches back. The plants use the same carbon dioxide, and the Cycle continues. This Cycle restores the Oxygen content in the biosphere, and the period is crucial for life to grow and survive. Photosynthetic algae are important microorganisms in this regard. As well, chemoautotrophs, primarily bacteria and archae are capable of carbon dioxide conversion. The oxygen cycle, along with the carbon and nitrogen cycles, is critical to the survival of life on Earth. The oxygen cycle is a biological process that serves to maintain oxygen levels by travelling through the atmosphere, lithosphere, and biosphere. All aerobic organisms use free oxygen for respiration. Animals exhale Carbon dioxide back into the atmosphere which is again used by the plants during photosynthesis. Now oxygen is balanced within the atmosphere. Carbon cycle shows the movement of carbon in elemental and combined states on earth.