Multiple Choice
Which of the following best explains how a cow obtains the carbon it needs for growth?
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9. Photosynthesis
Introduction to Photosynthesis
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Which two carbon sinks play a major role in removing carbon dioxide ($\mathrm{CO_2}$) from the atmosphere?
A
Volcanoes and fossil fuels
B
Forests and oceans
C
Deserts and glaciers
D
Mountains and urban areas
Verified step by step guidance1
Understand the concept of a carbon sink: A carbon sink is a natural system that absorbs and stores carbon dioxide ($\mathrm{CO_2}$) from the atmosphere, helping to regulate the Earth's carbon cycle.
Identify the major natural carbon sinks: Forests and oceans are the two primary carbon sinks. Forests absorb $\mathrm{CO_2}$ through the process of photosynthesis, while oceans absorb $\mathrm{CO_2}$ from the atmosphere and store it in dissolved forms or as part of marine organisms.
Eliminate incorrect options: Volcanoes and fossil fuels are sources of $\mathrm{CO_2}$ emissions, not sinks. Deserts and glaciers do not play a significant role in absorbing $\mathrm{CO_2}$. Mountains and urban areas are also not major contributors to $\mathrm{CO_2}$ removal.
Focus on the correct answer: Forests and oceans are the correct answer because they actively remove $\mathrm{CO_2}$ from the atmosphere and store it in biomass or water.
Conclude with the importance of these sinks: Forests and oceans are critical for maintaining the balance of $\mathrm{CO_2}$ in the atmosphere, mitigating climate change, and supporting ecosystems.
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