Question

Which describes an extreme environment where Archaebacteria might live?

Answer 1

In hot thermal trenches of deep sea, Archaebacteria can be found, where no other organisms could survive such high temperatures.

Answer 2

The Archaebacteria are the most primitive bacteria that defines the limits of life.

Members of this archaea include the bacteria that can survive in the temperature range of 113 °C and found living in hydrothermal vent.

Example: Pyrolobus fumarii

Some of the Archaebacteria were found in the most acidic conditions (soil) that were  known to grown at the pH of 0 and were known as methanogens.

These bacteria were capable of producing methane gas in hot spring and marshes, et cetera.