Final answer:
Cutting down rainforests decreases photosynthesis, thereby increasing CO2 in the atmosphere and disrupting the carbon cycle.
Step-by-step explanation:
Cutting down the Earth's huge rainforests would have a significant impact on the carbon cycle. The correct answer to the question is B. The rate of photosynthesis would decrease and more carbon dioxide would be found in the atmosphere. Rainforests play a crucial role in absorbing CO2 from the atmosphere through photosynthesis, a process in which they convert carbon dioxide into organic compounds, particularly sugars, while releasing oxygen. When these forests are cleared, not only is this important carbon sink reduced, but the stored carbon in the trees is often released back into the atmosphere, especially if the wood is burned. This contributing to an increase in atmospheric CO2 levels, which is a greenhouse gas. Deforestation, therefore, exacerbates global warming and can lead to changes in global climate patterns.