If grass stores 1,000 energy units received from the sun, the ecological efficiency of the ecosystem is 10%, and the trophic levels are grass ? cow ? human, how many units of energy does the human receive of the original 1,000 units?
A. 900
B. 200
C. 100
D. 10
E. 1
Answer: D
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Most of the water in the Rocky Mountain region comes from ________
Fill in the blank(s) with correct word
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