Szukana fraza: [Opis = "Mammals are characterized by a wide range of body sizes and highly variable population densities. They are important in energy flow of ecosystems due to the high energetic cost of homeothermy, due to high turn\-over rates in populations of small mammals, and due to low efficiency of production. Biomass of mammals is small in comparison to that of soil invertebrates but exceeds above\-ground invertebrates in many grasslands, indicating a high contribution to mineralization rates by mammals."]

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