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An obligate parasite, or holoparasite, is a parasitic organism that cannot complete its life-cycle without exploiting a suitable host. If an obligate parasite cannot obtain a host it will fail to reproduce.
Best Answer: A parasite is a form of insect/living creature, which spends some (or all) of its life cycle within a host. An example of this is the scabies parasite-a mite, which burrows into the skin to lay its eggs. Bacteria are simple microorganisms.ost bacteria are harmless, but some are more dangerous than others. For example the E.Coli bacterium is linked to food poisoning. Bacteria are the main cause of more severe infections such as pneumonia, meningitis, skin infections etc.