Until recently, the Archaea were classified with Bacteria in the Kingdom Monera. They have now been separated into their own domains, yet they do share some similarities with Bacteria. In which of the following ways are the Archaea similar to Bacteria?

They both lack a membrane-bound nucleus.
They both can survive in extreme environments.
They have the same types of cell membranes.
They replicate their DNA the same way.

They both can survive in extreme environments.