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Author Question: How many elements are essential to life? A) 10 B) 30 C) 70 D) ... (Read 32 times)

RODY.ELKHALIL

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on: Aug 27, 2018
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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Reply #1 on: Aug 27, 2018
Answer to Question 1

B

Answer to Question 2

B


RODY.ELKHALIL

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Reply 2 on: Aug 27, 2018
Wow, this really help

blakcmamba

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Reply 3 on: Yesterday
Gracias!

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