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Which of the following are likely to be present in deep sea water?

1. Eubacteria
2. Blue-green algae
3. Saprophytic fungi
4. Archaebacteria

Correct answer: Archaebacteria

Solution

Archaebacteria (archaea) are well known for living in extreme environments, including deep-sea settings with high pressure and limited nutrients. The other groups are generally more common in surface or less extreme habitats.

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