Carbon Cycle
plants absorb sunlight, water and CO2 to start the process of photosynthesis. These plants either die in which the carbon is decomposed into the soil as nutrients or consumed by an organism. When the organism either dies or is consumed, the carbon energy transfers over to the other organism or decomposes into the soil.
Energy Flow
The largest source of energy for the tundra is the sun. The sun allows for photosynthesis and plant growth which in turn feed organisms (solar energy to chemical energy). These organisms can then feed on other organisms. Energy left from a dead animal can be consumed by decomposers. Decomposers process organic materials put nutrients back into the ecosystem which is then absorbed by plants and taken into organisms.