Which of the following statements correctly describes "stomata" and their function in the leaf?

• A. Stomata are cells that contain chloroplasts for photosynthesis.
• B. Stomata are structures that store water for the plant.
• C. Stomata are tissues that transport nutrients throughout the plant.
• D. Stomata are openings that allow gases to diffuse in and out of the leaf.

Answer: (D)