Plants use their leaves to photosynthesize and produce food from sunlight, carbon dioxide, and water. Leaves help plants by absorbing sunlight to fuel photosynthesis, taking in carbon dioxide from the air, and regulating the plant's water levels through tiny holes on their surface. Leaves also protect plants by deterring predators through poison, sharp edges, or tough textures, and some leaves have waxy coatings or fuzz that help retain water in dry environments.