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Final answer:
The immune system is a complex network of cells, tissues, and organs that defend the body against pathogens and disease causes.
Explanation:
The immune system is a network of cells, tissues, and organs that work together to defend the body against attacks by "foreign" invaders. This complex system is responsible for protecting the host from various pathogens and disease causes, such as tumor cells. It consists of two main subsystems: the innate immune system and the adaptive immune system.
Learn more about Immune system here:
https://brainly.com/question/50823677
Answer: A. A complex system of cells, proteins, and organs
Explanation:
The immune system is a network of cells, proteins, and organs that helps fight off any substances than can be harmful to the body and make you sick. The immune system has two parts the innate which is the one you’re born with and the adaptive which is the one that develops with you as your body grows.
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