Some elements are essential for life, others are toxic, and others are neutral.
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Q21: A flow of energy is a fundamental
Q22: Net production is biomass that is left
Q23: Heterotrophs, the primary producers, are the first
Q24: Unlike materials, which cannot be recycled, energy
Q25: Most ecosystems have several interconnected food chains
Q27: Organisms are not selective in their uptake
Q28: A system that supports and sustains life
Q29: Some elements that are essential to the
Q30: In general, residence times are short in
Q31: Different elements generally take the same pathways
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