4.5a FOOD CHAINS

a food chain links together all the trophic levels --> producer, primary consumer, secondary consumer, tertiary consumer.

in a food chain:

-     there is only one organism shown at each trophic level.

-     you cannot show an animal as an omnivore

-     you cannot show animals feeding at more than 2 trophic levels

a food chain shows the flow of matter and also shows the flow of energy.