The two correct answers that describe how photosynthesis and cellular respiration contribute to the cycling of carbon among Earth's systems are:
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Plants convert carbon from the atmosphere to sugars through photosynthesis.
- This process takes place as plants absorb carbon dioxide (CO₂) from the atmosphere and use it, along with sunlight, to produce glucose (sugars) and oxygen.
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Cellular respiration uses oxygen from the atmosphere to produce energy and carbon dioxide.
- During cellular respiration, organisms (including plants and animals) use oxygen to metabolize glucose for energy, producing carbon dioxide as a byproduct, which is then returned to the atmosphere.
These processes are fundamental components of the carbon cycle, facilitating the transfer of carbon between various Earth systems.