Parasitism .
Fish can get parasites that harm them. Dogs can also get harmed by heartworms those are parasites. Humans can also be harmed by parasites. there are many parasites that can affect people.
if the host dies the nutrients die with it so parasites will die as well, until they find a new host
You worded your question pretty confusingly.Parasites live off the host that they are infecting, so technically the parasites are begins supported by the host itself. The role of the parasites are to infect a suitable host and start eating their energy up. That could result in the death of the host, when the population of the parasites grow.partnershostsholderscarriers
Parasites get benefit but host is harmed .Parasites are highly modified .
Parasites identify a specific host cell that they can partner with.
By being parasites and doing what they do best, living off its host
they are snidy
Are parasites that live on the surface of the host.
Parasites
Are parasites that live on the surface of the host.
they are either eaten or transfered by blood