posted by Jack .
Which of the following body systems does the immune system rely on to provide the first line of defense against pathogens.
A. Integumentary system
B. Nervous system
C. circulatory system
D. endocrine system
I think it is C
Be sure you understand the functions of each of those systems.
When in danger or in doubt, pick the one you never heard of :)
I love ur glee reference hopefully they do a glee reboot I would totally watch that. Any body else want a glee reboot if you do I LOVE YOU.