PARASITOLOGY - SYMBIOSIS
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10 Terms
Symbionts
Organisms that are very closely associated with another, usually larger, organism (host). Can live on, in or sometimes very near to its host
Ectosymbionts
Attached to the outside of the host
Phoresis
Exists when two symbiotes are merely “traveling together” E.g. bacteria on a fly’s legs
Endosymbionts
Within the body of the host
Phoresis & commensalism
loose association
Mutualism & parasitism
intimate association
Commensalism
Occurs when one membe r of the associating pair, usually the smaller, receives all the benefits and the other member is neither benefited nor harmed
Facultative
both species are capable of living independently from one another
Obligate
one must live in association with its partner
Mutualism
Occurs when each member of the association benefits the other ● Mutuals are metabolically dependent o n one another, one cannot survive in the absence of the other
Note 
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