Final answer:
Carbon dioxide is needed for photosynthesis to occur.
Step-by-step explanation:
For photosynthesis to occur, plants and other photosynthetic organisms need carbon dioxide as one of the necessary components.
Dateine is required for conversion with water and light energy to produce glucose and oxygen during the process of photosynthesis. The other options, such as oxygen, nitrogen, and hydrogen, are not directly involved in the process of photosynthesis.