Which three processes began to reduce carbon dioxide levels in the atmosphere when life evolved on Earth?

The most suitable answer involves the processes that played a significant role in reducing carbon dioxide levels in the atmosphere as life began to evolve on Earth. Photosynthesis is a key process wherein plants, algae, and some bacteria convert carbon dioxide and sunlight into glucose and oxygen. This process not only provides essential energy for living organisms but also reduces carbon dioxide levels in the atmosphere, making it crucial for the development of life.

Fossil fuel formation occurs when organic materials from dead plants and animals are buried and subjected to heat and pressure over millions of years. During this process, carbon from these organisms becomes sequestered underground as coal, oil, or natural gas, effectively removing carbon from the atmosphere over geological timescales.

Rock sedimentation, meanwhile, refers to the process where minerals and organic materials accumulate and form sedimentary rocks. This process also plays a role in trapping carbon in the Earth's crust, thereby contributing to the long-term reduction of atmospheric carbon dioxide levels.

These processes work together to create a balance, helping stabilize Earth's climate, particularly during the early stages of biological evolution, when atmospheric composition began shifting significantly due to the emergence of life. The other options include processes that either contribute to carbon dioxide levels or are not directly tied to atmospheric reduction in this context