The quantitative studies of an ecosystem are carried out by two way i.e by studying the food chain or food web, and by ecological pyramids. The ecological pyramids are the pyramids of number. It is diagrammatic representation of tropic levels. i.e. producers, herbivores and carnivores. Pyramid is drawn on the basis of their number. The second way is the use of pyramid of biomass, instead of numbers are each level it involves total mass of the living organisms present at each tropic level. The third way of study is pyramid energy.
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