Nearly all organic compounds from which living beings are made have as their backbone,chains or rings of _____ atoms.
A) aluminum
B) oxygen
C) carbon
D) nitrogen
E) none of the above
Correct Answer:
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Q5: To avoid a nitrate depression period when
Q6: Soils with thick horizons consisting mainly (>
Q7: Which of the following added to a
Q8: Detritus consists of _.
A)living organisms and cells
B)dead
Q9: Which of the following is a greenhouse
Q11: Alcohols,methane and organic acids of various kinds
Q12: Suppose leaves containing 1000 kg of carbon
Q13: Char is made up of _.
A)living organisms
Q14: Which of the following is (are)major sources
Q15: Under natural vegetation,about 60 to 90% of
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