Historically, archaea were referred to as archaebacteria and were categorized as bacteria. However, it was found that, in contrast to bacteria, archaea have a unique evolutionary history.
<h3>What are the differences between archaea and bacteria?</h3>
A domain or kingdom of unicelled microbes is called the Archaea. Since these microorganisms are prokaryotes, their cells lack a cell nucleus and any other membrane-bound organelles. A significant portion of prokaryotic microorganisms are bacteria. Bacteria come in a variety of shapes, and are typically only a few micrometers long.
Archaea live in extreme environments such as hot springs, gut of ruminants and humans, marshland etc. Bacteria are ubiquitous, they are found everywhere.
Paneth cells are specialized immune cells that are found in the gastrointestinal tract. Paneth cells act as anti-microbial defence for our bodies. It is found in the crypts of the intestine. It is also responsible for the renewal of epithelial layer cells which keep bacteria from entering the intestines.
