In the section "Investigating Life:E. T. and the Origin of Life," why were amino acids analyzed for ¹⁵N levels?
A) Nitrogen is not present in nucleotides or carbohydrates.
B) Nitrogen is not present in nucleotides or lipids.
C) Nitrogen is not present in carbohydrates or lipids.
D) Nitrogen is not present in amino acids or carbohydrates.
E) Nitrogen is not present in nucleotides or amino acids.
Correct Answer:
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