Question

Archaea include $\underset{–}{}$

• A. gram-positive, gram-negative and wall-less bacteria
• B. methanogens, halophiles and thermoacidophiles
• C. mutualistic, parasitic and commensalistic bacteria
• D. obligate and facultative anaerobes

Answer 1

The correct option is B methanogens, halophiles and thermoacidophiles

There are three major known groups of Archaebacteria: methanogens, halophiles, and thermophiles. The methanogens are anaerobic bacteria that produce methane. Thermophiles are heat-loving bacteria found near hydrothermal vents and hot springs.The halophiles, named after the Greek word for "salt-loving", are extremophiles that thrive in high salt concentrations. Archaebacteria emerged at least 3.5 billion years ago and live in environments that resemble conditions existing when the earth was young.