Question

A complex response system that protects the body from bacteria, viruses,

and other foreign substances
O endocrine system
immune system
O circulatory system
blood system

Answer 1

The immune system protects the body from possibly harmful substances by recognizing and responding to antigens. Antigens are substances (usually proteins) on the surface of cells, viruses, fungi, or bacteria.

Step-by-step explanation:

Answer 2

Answer: the immune system

Step-by-step explanation:

why?

The definition of it is exactly how the question describes "responsible for protecting the body from germs" and the definition "a network of cells, tissues, and organs that work together to protect the body."