Classification, variation, food webs and pyramids

Classification

 

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BBC Simulations (variation activity, deadly 60 animals)

 

 

 

 

 

 

 

 

 

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Classifying animals

 

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Food webs

 

 

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Food Pyramids

 

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.

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Simulations