Always harmful to their host
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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.
Fungi and Bacteria that gain nutrients from once living organisms are called decomposers. Organisms that gain nutrients from living organisms is called parasites.
parasites
No, bacteria and parasites are different types of organisms. Bacteria are single-celled microorganisms that can be beneficial or harmful, while parasites are organisms that live on or inside another organism (the host) and rely on the host for nutrients and shelter. Parasites can be bacteria, but not all bacteria are parasites.
A relationship in which one kind of organism lives on or in another organism an may harm the organism is called parasitism. The organisms that live on or in other organisms are parasites. The organisms they feed on are called hosts. The parasites benefit from the relationship. The hosts are harmed by it. JUST TO LET YOU KNOW I GOT ALL THIS INFORMATION FROM AN AUDUBON TRADITIONAL ELEMENTARY SCHOOL!
The scientific word for human parasites is "pathogens" or "parasitic organisms."