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1. |
What is energy input in unsubsidized natural solar powered ecosystem? |
A. | 5000-10,000 kcal.m² per year |
B. | 3000-10,000 kcal.m² per year |
C. | 2000-10,000 kcal.m² per year |
D. | 1000-10,000 kcal.m² per year |
Answer» E. | |