A tapeworm in the intestine of larger animals including man and absorbing nutrients from their host is a type of parasitic symbiotic relationship.
Organisms interact with one another. There are different types symbiotic interactions.
A parasitic interaction is one in which an organism called the derives benefit from the host and causes harm to it. Nutrients needed by these large organisms for their own nutrition are taken up by these intestinal works. They cause actively feeding organisms to suffer and die eventually because they are not nourished.
In mutualism, two organisms lives together and derives benefit from one another. An example is algae and lichen.
In commensalism, one organism derives benefit without harming the other.
