A fish parasite, the isopod Cymothoa exigua, replacing the tongue of a Lithognathus Parasitism is a close relationship between species, where one organism, the parasite, lives (at least some of the time) on or inside another organism, the host, causing it some harm, [1] and is adapted structurally to this way of life. [2] The entomologist E. O. Wilson characterised parasites ' way of feeding as "predators that eat prey in units of less than one". [3] Parasites include single-celled protozoans ... Parasites live in other host organisms and depend on them for survival. Parasites that can affect humans include ticks, lice, and hookworms. Symptoms of a parasite infection in humans can... Learn about parasites , tiny organisms that can live inside or on the human body, causing various diseases. Find out how to prevent, diagnose and treat parasitic infections with antiparasitic medications and natural remedies. Generally, the discovery of parasites in ancient humans relies on the study of feces and other fossilized material. The earliest known parasite in a human was eggs of the lung fluke found in fossilized feces in northern Chile and is estimated to be from around 5900 BC.
