A life-supporting system must have a source of usable __________ and a sink for degraded energy.
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Q1: What is the role of volcanism in
Q2: What elements -- beneficial or harmful --
Q3: An _ is the basic life-supporting system
Q4: The total amount of organic matter on
Q6: Carbohydrate production and the consequent building of
Q7: The production of body mass by heterotrophs
Q8: Energy is transferred along _ chains in
Q9: When there are several interconnected food chains
Q10: In its most general form, a _
Q11: _ is a measure of how easily
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