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

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.

Explanation:

answer; ///first they would cross the atlantic ocean, and end up either in europe or africa; good luck

answer; jewish immigrants;