Ascaris in human body is an example of :
Ectoparasite
Commensalism
Endoparasite
Mutualism
Endoparasites -
Those that live inside the host body at different sites (liver, kidney, lungs, red blood cells etc.)
- wherein
The life cycle of endoparasites is more complex because of their extreme specialisation. Their morphological and anatomical features are greatly simplified while emphasising their reproductive potential. Brood parasitism in birds is a fascinating example of parasitism in which the parasitic bird lays the eggs in the nest of its host and lets the host incubate them.
So, Correct option is 3