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Question
A natural ecosystem, undamaged by human activity, is a(n) ________.A) mostly closed system of organic materials and energy; everything is recycled
B) open system of organic materials and an open system of energy, everything is recycled
C) mostly closed system of organic and inorganic materials, and an open system of energy
D) mostly closed system of organic and inorganic materials, and a closed system of energy; everything is recycled
E) open system of inorganic materials, and an open system of energy
Answer
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Related questions
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