Food chains and webs

Food chains and webs

1. All living things need energy. The producer is a plant, and takes it's energy from the sun

   • Next is the primary consumer, like a rabbit or a cow (vegetarian)
     • Then the secondary consumer like a fox, or a human
       • And finally the tertiary consumer, like a owl or a human (obviously not many food chains have these)

2. The position of an animal in a food chain is called it's trophic level

3. A pyramid of numbers is a graph shaped like a pyramid (or sometimes inverted), and it shows the different animals in a food chain

   • For example, if it is inverted, then it shows that there is only one (huge) producer, and a lot of secondary/tertiary consumers

4. A pyramid of biomass shows the mass of each producer/consumer

5. There can also be multiple food chains leading off from one producer