Methanogens are always engaged in relationships with other microbes because methane production requires ________.

A. interspecies hydrogen transfer
B. energy provided by another microbe
C. removal of oxygen from the environment by another microbe
D. None of the choices are correct.


Answer: A

Biology & Microbiology

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Syphilitic tumors called ________ develop in the liver, skin, bone, and cartilage during the tertiary stage of syphilis.

Fill in the blank(s) with the appropriate word(s).

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