Which organism is autotrophic, nostoc or a spirochete?

Nostoc is autotrophic, meaning it produces its own food through photosynthesis, converting light, carbon dioxide, and water into energy. In contrast, spirochetes are typically heterotrophic, meaning they obtain energy by consuming organic matter, and are not capable of photosynthesis. Spirochetes are a type of bacteria that rely on external sources of organic carbon for survival.