Final answer:
Archaea and bacteria are both unicellular prokaryotic microorganisms. They have similarities such as being single-celled and lacking membrane-bound organelles. However, there are genetic and biochemical differences between them. Archaea are often extremophiles and have distinct cell walls and membranes. Bacteria can be found in diverse habitats, including the human body.
Step-by-step explanation:
Archaea and bacteria are both prokaryotic and unicellular microorganisms. They share similarities such as being single-celled, having a single circular chromosome of DNA, and lacking membrane-bound organelles. Additionally, both archaea and bacteria can have flagella for movement. However, there are significant genetic and biochemical differences between archaea and bacteria. Archaea have distinct cell walls and plasma membranes, and their ribosomal proteins are more similar to those found in eukaryotic cells. Archaea are often extremophiles, living in extreme environments, while bacteria can be found in various habitats, including the human body.