Question

what is immune system

Answer 1

Explanation:

The immune system is a host defense system comprising many biological structures and processes within an organism that protects against disease. ... Even simple unicellular organisms such as bacteria possess a rudimentary immune system in the form of enzymes that protect against bacteriophage infections.

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Answer 2

Answer:

The immune system is a complex network of cells and proteins that defends the body against infection.

Explanation:

The immune system keeps a record of every germ it has ever defeated so it can recognize and destroy the microbe quickly if it enters the body again.

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