Bacteria and archaea are placed in separate kingdoms because: A-. they both are unicellular.
B-. their structure and chemical makeup differs.
C-. bacteria are autotrophs and archaea are heterotrophs. D-. bacteria are prokaryotes and archaea are eukaryotes.
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Answer:
The answer is B.
Explanation:
A cannot be the answer because they won't be placed in different kingdoms if they had a similarity. C cannot be the answer because most bacterias are heterotrophs. D cannot be the answer because both Bacteria and Archaea are prokaryotes.
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