By Hannah Justin Ryan and will
They show the energy flow and eating patterns in a Eco system.
The energy flow goes down 10% to each organism.
For example the primary producer may have 20000 energy components, then the primary consumer would have 2000 then the secondary consumer would have 200 then the tertiary consumer would have 20.
A food web is a combination of food chains in an Eco system. It creates a more accurate flow of energy