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Organisms called methanogens are most abundant in a:

1. Sulphur rock
2. Cattle yard
3. Polluted stream
4. Hot spring

Correct answer: Cattle yard

Solution

Methanogens are archaea that produce methane in oxygen-free environments rich in decaying organic material. Cattle yards, especially in manure and rumen-associated waste, provide ideal anaerobic conditions for them, so they are most abundant there.

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