A marine biologist took a sample from a hot spring. The cell has no nucleus and looks different from bacteria found in water.

bacteria

archaea

eukarya

Archaea

Explanation:

Archaea are similar to bacteria in that both lacks membrane bound organelles and nucleus.

Archaea are mostly found in extreme regions of the world e. g places with high temperatures.

They are generally known to lack peptidoglycan in their cell wall.