Unlike materials, which cannot be recycled, energy is cycled endlessly through ecosystems.
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Q19: _ biomes are distinguished primarily on the
Q20: The parts of the ocean that are
Q21: A flow of energy is a fundamental
Q22: Net production is biomass that is left
Q23: Heterotrophs, the primary producers, are the first
Q25: Most ecosystems have several interconnected food chains
Q26: Some elements are essential for life, others
Q27: Organisms are not selective in their uptake
Q28: A system that supports and sustains life
Q29: Some elements that are essential to the
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