The upright pyramid of number is absent in

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(B) In a forest ecosystem,the pyramid of number is inverted or spindle-shaped rather than upright. This is because a single large tree (producer) can

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(B) In a forest ecosystem,the pyramid of number is inverted or spindle-shaped rather than upright. This is because a single large tree (producer) can support a large number of herbivorous birds or insects (primary consumers),which in turn support a smaller number of predatory birds (secondary consumers). Since the base representing the producers is narrower than the level representing the primary consumers,the pyramid is not upright.

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