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The gymnosperms were more widespread in the past than recently and are now represented by the pines.
Infectious Diseases
Diseases caused by pathogenic microorganisms, such as bacteria, viruses, parasites or fungi, that can be spread, directly or indirectly, from one person to another.
Antibodies
Proteins produced by the immune system in response to foreign substances, known as antigens, to neutralize or destroy them.
Immune System
The body's defense system composed of organs, tissues, cells, and proteins that works together to protect the body against pathogens, including viruses, bacteria, and foreign bodies.
Immunization
The process by which a person is made immune or resistant to an infectious disease, typically by the administration of a vaccine.
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