Autotrophs Make Their Own Food Using Energy From. Most autotrophs use a process called photosynthesis to make their food. For the most part, autotrophs often make their own food by using sunlight, carbon dioxide, and water to form sugars which they can use for energy.
Chemosynthesis is used to produce food using the chemical energy stored in inorganic molecules. They obtain carbon dioxide from the atmosphere. They can do so using light, water, and carbon dioxide, in a process known.