Parasite
Definition 1 of 2
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Biological Context
The term 'parasite' in biology often implies harm to the host organism. The oak tree was infested with parasites, causing it to weaken.
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Host Specific
Some parasites only live on specific hosts and are not found elsewhere. The panda bear has a unique parasite that does not affect any other species.
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Not Always Visible
Parasites can be microscopic and not always seen by the naked eye. Despite being invisible, the microscopic parasites were causing him discomfort.