Question: is anabaena autotrophic or heterotrophic?
Answer: Photosynthetic autotrophs, which make food for more than 99% of the organisms on earth, include only three groups of organisms: plants such as the redwood tree (a), algae such as kelp (b), and certain bacteria like this Anabaena (c). Heterotrophs cannot make their own food, so they must eat or absorb it.