Can I have help with this question
(It's in the picture)​

First line of defense  ⇒ mechanical barriers that prevent microorganisms from entering the body

Second line of defense  ⇒ cells and prosses that help remove or neutralize organisms that have penetrated mechanical barriers.

Third line of defense  ⇒ complex defense that recognizes and reacts to specific organisms.

I hope this helps!

i believe it is the last one. im sorry if im wrong!

well when looking at this if you think about it   negativley and positivley   react with each other and when the first layer gets full they add layers it starts with 2 on the first layer and it constantly goes on until the official number is there