Organisms in phylum Thermarchaeota were first identified as distinct from Crenarchaeota when ________.
A. the unique membrane lipid thermarchaeol was discovered in mesophilic ammonia oxidizers
B. not all members of the phylum could oxidize ammonia
C. all members of the phylum Crenarchaeota were cultured in the laboratory and found to be different
D. whole-genome sequences were processed and compared
Answer: A
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