Describe how carbon is cycled through the biosphere. Your response should begin with carbon dioxide in the atmosphere and include the contribution of plants, animals, and decomposers.

Answer 1

The carbon cycle begins with carbon dioxide in the atmosphere, where it is absorbed by plants during photosynthesis. Plants use this carbon to create carbohydrates and other organic molecules, which are then consumed by animals. Through respiration, animals release carbon dioxide back into the atmosphere.

When plants and animals die, decomposers like bacteria and fungi break down their remains, releasing carbon back into the soil. Some of this carbon is then reabsorbed by plants through their roots, completing the cycle.

Additionally, some carbon is stored in the soil for long periods of time as organic matter or in the form of fossil fuels. When humans burn fossil fuels for energy, carbon dioxide is released into the atmosphere at a faster rate than natural processes can absorb it, leading to an imbalance in the carbon cycle and contributing to climate change. Overall, the cycling of carbon through the biosphere helps maintain a balance of carbon in the atmosphere and is essential for sustaining life on Earth.