4.4 Explain the names given to different trophic levels to include producers, primary, secondary and tertiary consumers and decomposers

Producers
Produce their own 'food' (glucose) from the sun's light energy

Primary consumer
Eats (consumes) producer and gains its energy; often a herbivore

Secondary consumer
Eats (consumes) primary consumer and gains its energy; often an omnivore

Tertiary consumer
Eats secondary consumer and gains its energy; top of the food chain; often a carnivore

When these die, they're broken down by fungi and bacteria. Nitrogen and carbon compounds are returned to the earth (see cycles)