Bacteria were among the first living things to appear on Earth. We know that bacteria form symbioticand parasitic relationships with both animals and plants. Symbiosis is when two biological organisms live off of each other for mutual survival. Parasitism is a relationship between two different organisms where the parasite harms the host.
Bacteria are ubiquitous. No matter where they first appeared they can now be found in virtually any of Earth’s habitats: water, soil and deep into earth’s crust, our atmosphere, glaciers and other ice…even radioactive waste! They are known to have flourished in manned spacecraft and on carbon and plastic, ironically, which has deep implications for treating bacteria.