In a helminth life cycle, which host harbors the adult, sexually active stage of the pathogen Definitive host.
Helminths are multicellular eukaryotic animals that generally posses digestive ,circulatory, nervous ,excretory and reproductive systems. Tissues and organs heterotrophic parasitic often lack organ systems of free-living relatives. Helminths cannot reproduce inside a host organism. Rather, these organisms tend to have a life cycle in which the adult nematode lives inside the host intestine, producing eggs, which are then shed with the host's feces.
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