Answer: D. Plants release oxygen and take in carbon dioxide through the stomata in leaves
Explanation:
Plants evolved from freshwater green algae and eventually developed strategies that adapt them well for life on land. The major source of plant nutrition is the fixation of atmospheric CO2 into simple sugar using the energy of the sun. CO2 enters through the stomata. O2 is a product of photosynthesis and atmospheric component that also moves through the stomata. It is used in cellular respiration to release energy from the chemical bonds in the sugar to support growth and maintenance in the plant. Water and gas diffusion into and out of a plant occurs through tiny mouth-shaped openings called stomata (singular, stoma).
