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Chemical Barrier
A chemical barrier refers to a mechanism of defense provided by the secretion of chemicals that deter pathogens or predators.
Pathogens
microorganisms that cause diseases in their hosts.
Foreign Substance
Any material or substance that is not naturally part of an object or body and may be harmful or benign.
Disease-causing Agent
An organism or substance that is capable of producing disease, such as bacteria, viruses, or toxins.
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