Heterotrophs, the primary producers, are the first trophic level.
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Q18: _ are the most widely varied of
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
Q24: Unlike materials, which cannot be recycled, energy
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
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