Final answer:
Primary producers are organisms that convert light energy through photosynthesis and produce energy-rich compounds that can be used later by other organisms. They are also called autotrophs and are the foundation of ecosystems.
Step-by-step explanation:
Primary producers are organisms that convert light energy through photosynthesis and produce energy-rich compounds that can be used later by other organisms. They are also called autotrophs and are the foundation of ecosystems. Examples of primary producers include plants, algae, and photosynthetic bacteria.
Consumers, on the other hand, obtain their energy by feeding on primary producers or other consumers. Herbivores eat producers, carnivores eat other consumers, and omnivores eat both. Decomposers also play an important role in ecosystems by helping to recycle nutrients.