The correct answer is option D. Stomata.
What are pores and functions?
Stomata are small pores on the surface of leaves and stems that regulate the flow of gas in and out of the leaves. Therefore, it regulates the whole plant. They adapt to local and global changes on all time scales, from minutes to thousands of years.
The stomata are composed of a special pair of epidermal cells called guard cells. Stomata regulate gas exchange between plants and the environment and control water loss by resizing the pores of the stomata.
Photosynthesis uses sunlight and carbon dioxide to make food, releasing the oxygen we breathe as a by-product. Because this evolutionary innovation is central to plant identity, almost all land plants use the same pores, called stomata, to take in carbon dioxide and release oxygen.
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