Complete the following nuclear equation: Bi ? ? + e
A) Po
B) Pb
C) Pb
D) Th
E) none of the above
A
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Water that is used to produce consumable items but not consumed directly is called ____________________.
Fill in the blank(s) with the appropriate word(s).
With which former Soviet republic does Armenia have a longstanding border dispute over Nagorno-Karabakh?
A) Georgia B) Azerbaijan C) Ukraine D) Russia E) Moldova
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
The highest rates of AIDS infection are in:
A) Northern Africa B) Southern Africa C) Western Africa D) Eastern Africa E) none of the above