Which one of the following is not a type of heterotroph? a. carnivore b. omnivore c. cyanobacteria d. decomposer

c. cyanobacteria Cyanobacteria are photosynthetic organisms and are not considered heterotrophs. They can produce their own food through photosynthesis, unlike carnivores, omnivores, and decomposers, which rely on consuming other organisms or organic matter for energy.