Examlex
Negative externalities lead markets to produce a smaller quantity of a good than is socially desirable, while positive externalities lead markets to produce a larger quantity of a good than is socially desirable.
Immunization
The process by which an individual's immune system becomes fortified against an agent (known as the immunogen).
Disease-Causing Organism
A pathogen, such as bacteria, viruses, fungi, or parasites, that can infect humans and animals, leading to disease.
Mucous Membranes
The moist tissue linings of various body cavities, including the mouth, nose, throat, and reproductive tract, that protect against infection.
Mechanical Barriers
Physical or structural methods used to prevent or control the entry or exit of harmful substances or organisms in a particular area.
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