Final answer:
Rain forests and oceans clean the Earth's atmosphere by absorbing carbon dioxide.
Step-by-step explanation:
The correct answer is B. Rain forests.
Rain forests clean the Earth's atmosphere by absorbing carbon dioxide and releasing oxygen through the process of photosynthesis. They act as the lungs of the planet, helping to maintain the balance of gases in the air.
In addition to rain forests, oceans also play a significant role in cleaning the atmosphere. They act as carbon sinks, absorbing a large amount of carbon dioxide from the atmosphere.
While mountains and deserts have their own important functions in the ecosystem, they do not directly clean the Earth's atmosphere.
Learn more about The role of rain forests and oceans in cleaning the Earth's atmosphere