The immune system saves lives. ...
Before scientists understood the immune system, illness was chalked up to unbalanced humors. ...
Two men who unraveled the immune system's functions were bitter rivals. ...
Specialized blood cells are the immune system's greatest weapon. ...
The spleen helps your immune system work.
Answer:
I believe it's called culturing
Explanation:
I just asked my teacher
Answer:
becausae they are forshadowing on something that will happen later in the book most likely but i cant tell completely unless i have the excerpt
Explanation: