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| Description: (a) In this pyramid of numbers, the abundance of species in a typical British pond decreases with increasing trophic level. (b) An inverted pyramid of numbers, based on organisms living on an oak tree. (c) When amount of biological material is used instead of numbers of individuals, the pyramid is termed a pyramid of biomass. (d) An inverted pyramid of biomass in the English Channel. (e) A pyramid of production in the English Channel.
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