Endoparasites: Live inside the host
eg. Plasmodium, Tapeworm, Roundworms, Bot fly ect.
Parasite
Parasitism .
Organisms that live on other organisms without providing any benefit in return are known as parasites. They rely on the host organism for nutrients and can often cause harm or disease to the host. Some examples include ticks, tapeworms, and fleas.
Organisms that live in or on another organism (host) and benefit from the relationship at the expense of the host. Parasites can cause harm or disease to the host while gaining nutrients or protection for themselves. Examples include tapeworms, fleas, and ticks.
fungus
No viruses should not be considered living organisms because they require a host to live &therefore are not an organism but an infestation.
Starfish, mussels, that kind of thing.
Population
Parasites are organisms that live on or inside a host organism and obtain nutrients at the host's expense. Saprophytes are organisms that feed on dead or decaying organic matter. Both play important roles in nutrient cycling and ecosystem functioning.
Population
They do not live on or in the body of a host
Viruses attach to cells of a host (humans, other living organisms). This is how they reproduce and cannot live without a host. They either go into a lytic cycle where they just keep reproducing by using the cell of the host (it is kind of like hacking, and making the cell work for them). viruses can also go into lysogenic cycle where they just stay in the cell undetected until they decide they want to go into lytic cycle and reproduce.