Classification, variation, food webs and pyramids
BBC Simulations (variation activity, deadly 60 animals)
Bars represent trophic levels: Width of bar represents a quantity of the organism
Pyramids of number: this incorporates numbers of organisms
Trophic levels can be wider or narrower as you ascend levels, as this depends on numbers of organisms.
Pyramids of biomass: Biomass g/m2 : this incorporates size of organisms
Tend to be larger at bottom, and rows above shrink in size each time the trophic level ascends.