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Author Question: About 25 of the 92 natural elements are known to be essential to life. Which fou (Read 1172 times)

Hawke

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on: May 25, 2013
About 25 of the 92 natural elements are known to be essential to life. Which four of these 25 elements make up approximately 96% of living matter?
A) carbon, sodium, hydrogen, nitrogen
B) carbon, oxygen, phosphorus, hydrogen
C) oxygen, hydrogen, calcium, nitrogen
D) carbon, hydrogen, nitrogen, oxygen
E) carbon, oxygen, nitrogen, calcium


Melanie

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Reply #1 on: May 28, 2013
Quote from: Hawke on May 25, 2013
D) carbon, hydrogen, nitrogen, oxygen


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Hawke

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Reply #2 on: Jun 10, 2013
Thanks


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