Which of these statements is true about autotrophs, but not heterotrophs? -They use sugar and oxygen to make carbon dioxide and water.
-They use chlorophyll and oxygen to make carbon dioxide and water.
-They use sunlight, water, and carbon dioxide to make sugars.
-They use sunlight, water, and oxygen to make chlorophyll.

The third one,
Autotrophs use a process called photosynthesis to make their food. In photosynthesis, autotrophs use energy from the sun to convert water from the soil and carbon dioxide from the air into a nutrient called glucose. Glucose is a type of sugar. The glucose gives plants energy. Plants also use glucose to make cellulose, a substance they use to grow and build cell walls.