<http://schema.org/description>
"One kind of flatworm doesn&amp;#039;t have a working mouth, because the algae that lives inside of it makes food for the worm. Symbiosis is crucial to the survival of many species. In fact, you&amp;#039;re a symbiote yourself."^^<http://www.w3.org/2001/XMLSchema#string>
<http://science.howstuffworks.com/life/evolution/symbiosis2.htm>