The term bacteria refers to a large spectrum of unicellular species of microorganisms that are without organelles and a nucleus. In many cases, bacteria are infectious or pathogenic and can cause disease(s). However, many people tend to nickname bacteria as “germs” and overlook their potential or value.
Unlike a virus, bacteria can serve the interests of the host. The human body uses bacteria to build immunity and fight off infection. For example the human intestines contain the bacteria acidophilus and bifidus, which help stabilize colon health and function (creates regularity of the excretory system and aids digestion). Other bacteria in the human body may secrete useful hormones, chemical, and vitamins into the bloodstream, aiding health and metabolism.
Some scientists have even discovered a way to use bacteria to eliminate oil spills, preserving delicate, naturally-occurring aquatic ecosystems. In addition, the food industry uses bacteria cultures to form yogurt, cheese, milk, and a number of other common dairy products.
In comparison, the human body alone contains more bacteria than it does cells. In the entire world, there are more bacteria in existence than there are living, multicellular organisms (like people). They can be found (using a microscope) everywhere, although they cannot be seen by the naked, human eye.
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