In its most general form, a __________ cycle is the complete pathway that a chemical element follows through the Earth system.
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Q5: A life-supporting system must have a source
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
Q11: _ is a measure of how easily
Q12: The process of converting fixed nitrogen back
Q13: _ is weathered rock material that has
Q14: Soil contains _ , partially decayed organic
Q15: Soil _ is a measure of the
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