properties of parasites
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From a medical standpoint, parasites describe a number of multi-cellular organisms that are able to survive on or within the human body, but have side effects that are harmful to human health. Technically speaking, a parasite has two characteristics: Part of its life cycle must be spent within a host body; and.
A parasite is an organism that lives in another organism, called the host, and often harms it. ... Parasites live on or in other organisms and thrive to the detriment of their host. Many different parasites can affect humans, and they can pass on diseases such as malaria and trichomoniasis.
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They derive nutrition from human beings without killing them. Eg: Lice and Leech
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