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Methanogens are single-celled organisms that thrive in environments without oxygen and produce methane during their metabolic processes.

1. Methanogens require oxygen to survive.
2. Methanogens emit oxygen as a byproduct.
3. Methanogens emit methane as a byproduct.
4. Methanogens are oxygen-free, single-celled organisms.

Correct answer: Methanogens emit methane as a byproduct.

Solution

Methanogens are anaerobic microorganisms, meaning they thrive without oxygen. Their metabolism produces methane, so the statement about emitting methane as a byproduct is correct.

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