Explanation:

Organisms which synthesise carbohydrates from inorganic compounds using radiant energy are called producers e.g., all green plants.  The producers make the energy from sunlight available to the rest of the ecosystem.

Organisms which consume the food produced, either directly from producers or indirectly by feeding on other consumers are the consumers.

Microorganisms which break-down the complex organic substances into simple inorganic substances used by plants are called decomposers.

Carnivores and herbivores are types of consumers.