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Immune system Description, Function, & Facts Britannica. Web  immune system, the complex group of defense responses found in humans and other advanced vertebrates that helps repel disease-causing organisms (pathogens)..

Immune system Description, Function, & Facts Britannica
Immune system Description, Function, & Facts Britannica from cdn11.bigcommerce.com

WebThe immune system protects your child's body from outside invaders. These include germs such as bacteria, viruses, and fungi, and toxins (chemicals made by microbes). The immune.

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