Calculate what mass of plants (in g) a pair of starlings will retain from caterpillars when feeding 2 chicks to a mass

Calculate what mass of plants (in g) a pair of starlings will retain from caterpillars when feeding 2 chicks to a mass of 1.5 to 3 g each. If, according to the rule of the ecological pyramid, to increase 1 g of the mass of consumers of the 2nd order, 10 g of consumers of the 1st order are needed

Food chain: plants → caterpillars → chicks.
The chicks gained weight from 1.5 g to 3 g each, i.e. gain 1.5 g 2 = 3 g
According to the rule of the ecological pyramid: in order to grow 2 chicks, you need 3 · 10 = 30 g of caterpillars. These caterpillars would eat 30 x 10 = 300 g of plants. This means that a pair of starlings, feeding their chicks, will save 300 g of plants.

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