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Author Question: How many elements are essential to life? A) 10 B) 30 C) 70 D) ... (Read 48 times)

RODY.ELKHALIL

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How many elements are essential to life?
 
  A) 10
  B) 30
  C) 70
  D) 110

Question 2

The efficiency of current solar cells is approximately
 
  A) 3.
  B) 15.
  C) 25.
  D) 75.



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bigcheese9

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Answer to Question 1

B

Answer to Question 2

B




RODY.ELKHALIL

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Reply 2 on: Aug 27, 2018
Great answer, keep it coming :)


carojassy25

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Reply 3 on: Yesterday
Wow, this really help

 

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