Final answer:
The digestive and respiratory systems provide raw materials for cell energy release.
Explanation:
The digestive and respiratory systems are the two body systems that provide humans with the raw materials necessary for their cells to release energy.
In the digestive system, nutrients from food are broken down and absorbed into the bloodstream. In the respiratory system, oxygen is taken in and delivered to cells while carbon dioxide is removed, essential for cellular energy production.
Learn more about Human Body Systems here:
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