What are the archeabacteria's characteristics

Most protists are unicellular. You may be wondering why those protists are not classified in the Archaebacteria or Eubacteria kingdoms. It is because, unlike bacteria, protists are complex cells.

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Among these three main types of archaea are some subtypes, which include: Methanogens  — archaeans that produce methane gas as a waste product of their "digestion," or process of making energy. Halophiles  — those archaeans that live in salty environments.

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there are so many examples for that in different areas, like biology experiment carried out in our lab recently.

here's one link:

c should be the answer