EVERYDAY SCIENCE

Detailed explanation-1: -They are called archaea because they belong to the archaeal kingdom. They share some common characteristics with eukaryotes but are completely different from them. They are known as extremophiles because they can easily survive in generally harsh conditions such as the seafloor and volcanic vents.

Detailed explanation-2: -They live in the anoxic muds of marshes and at the bottom of the ocean, and even thrive in petroleum deposits deep underground. Some archaeans can survive the dessicating effects of extremely saline waters. One salt-loving group of archaea includes Halobacterium, a well-studied archaean.

Detailed explanation-3: -Archaebacteria are known to be the oldest living organisms on earth. They belong to the kingdom Monera and are classified as bacteria because they resemble bacteria when observed under a microscope.

Detailed explanation-4: -Archaea are microorganisms that define the limits of life on Earth. They were originally discovered and described in extreme environments, such as hydrothermal vents and terrestrial hot springs.

Detailed explanation-5: -Archaea is the main group to thrive in extreme environments.