2.9k views
3 votes
35.37

The first line of defense involves which structure(s)?
O
O
O
O
T-cells
skin
blood
B-cells
Mark this and return
Save and Exit
Next
Submit

User Ffrey
by
5.0k points

1 Answer

2 votes
The first line of denfense involves
Skin
User Pedru
by
4.4k points