On the basis of following features identify correct option. A. It is a graphic representation of...

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On the basis of following features identify correct option.
A. It is a graphic representation of number of individuals of different trophic levels in a foodchain in an ecosystem.
B. Pyramid is upright in case of grassland, and pond ecosystem, where the number of organisms decrease from producer level to top carnivore level.
a. Pyramid of biomass
b. Pyramid of energy
c. Pyramid of numbers
d. Both (a) and (b)
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