Symbiosis- interaction between two different organisms living in close physical association, typically to the advantage of both.
Parasitism- is a non-mutual symbiotic relationship between species, where one species, the parasite, benefits at the expense of the other, the host. Ex- Deer and ticks. The tick embeds it self under the deers skin and sucks the deers blood. This causes the deer serious discomfort but makes the tick happy.
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