host
The organism from which a parasite obtains nutritional needs is called a host. The host is a food source and a home for the parasite.
If you count bacteria and viruses, a virus tends to feed off bacteria.
parasite
It's called a "parasite".
It is called a Parasite. (Ex:Tapeworm.)
A Parasite
Parasite.
A parasite is an organisms that lives in or on another organism to obtain food directly.
The correct term, in this instance, would be parasite.
Parasites. Animals that live on other animals aren't always parasites. It depends on the type of symbiosis is taking place; commensalism (the animal obtains food and shelter from the other animal without hurting or helping it), mutualism (both animals benefit, sort of a 'you scratch my back i'll scratch yours' kind of thing), and parasitism (the name speaks for itself).
it is called parasite
The organism a parasite lives on is called a "Host".