1. Plants: Plants use the process of photosynthesis to make their own food. They use sunlight, water, and carbon dioxide to create glucose, which is a type of sugar that plants use for energy.
2. Bacteria: Some bacteria can make their own food through a process called chemosynthesis. They use chemical energy from inorganic molecules to synthesize organic molecules, such as glucose.
3. Algae: Algae are a type of plant that can photosynthesize. They use sunlight, water, and carbon dioxide to create glucose, which they use for energy.