Final answer:
Plants require sunlight, carbon dioxide, and water to make sugar molecules through photosynthesis. This process provides energy for plant growth and survival.
Step-by-step explanation:
Plants require three main ingredients to make sugar molecules through photosynthesis. They need sunlight as an energy source, carbon dioxide as a source of carbon, and water. During photosynthesis, plants use the energy from sunlight to convert carbon dioxide and water into glucose, a carbohydrate, and oxygen. This process is essential for plant growth and provides the energy that living organisms need to survive.