Question

when a disease - causing agent enters an organism, the immune system alerts which specialized cells?
○ red blood cells
○ epithelial cells
○ white blood cells
○ somatic stem cells

Explanation:

White blood cells are a key part of the immune system. They help defend the body against disease - causing agents like bacteria, viruses, etc. Red blood cells mainly transport oxygen. Epithelial cells form protective barriers. Somatic stem cells are undifferentiated cells that can give rise to various cell types but are not the immediate alert - cells of the immune system.

Answer:

white blood cells