An animal or plant that lives in or on another animal or plant(host). It obtains nourishment from the host without benefiting or killing the host. Some examples are lice and fleas.
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any organisms which lives on a host for the purpose of staying alive
in other words any organisms that lives on any other organisms to get nutrients which are essential for there are called parasites.
examples of parasites are :-
1 : 
2: fleas and
3: barnacles
   i hope it will help u .........keep smiling ^_^
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