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4 / 5  Which of the following is true of archaea that produce methane?
A  They reduce carbon dioxide in the presence of nitrogen.
B  They live in the most extreme environments.
C  They are always anaerobes.
D  They have been discovered on Mars.

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Source:  OpenStax, Microbiology. OpenStax CNX. Nov 01, 2016 Download for free at http://cnx.org/content/col12087/1.4
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