___________ is a measure of how easily a substance can be absorbed and used by organisms.
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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 _
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
Q16: The entire sequence of horizons from the
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