What part of a plant's leaves allows the plant to take in carbon dioxide and release oxygen?

 Plant leaves have small openings, called stomata, all over their surfaces. The stomata open to absorb the carbon dioxide needed to perform photosynthesis. They also open to release the oxygen produced by this process.

Explanation:

When the stomata are open, the plant can take in carbon dioxide from the air for photosynthesis and release oxygen (a byproduct of photosynthesis) back into the environment. While doing so, the plant also loses an enormous amount of water by evaporation. This process is called transpiration.

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