[Answer] Which of the following is the best evidence for a three-domain system? A) There are three distinctly different cell structures. B) There are three distinctly different cellular chemical compositions. C) There are three distinctly different Gram reactions. D) Some bacteria live in extreme environments. E) None of the above.

Answer: B
Which of the following is the best evidence for a three-domain system? A) There are three distinctly different cell structures. B) There are three distinctly differe…

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