Answer
a. Physical: Our skin acts as a physical barrier
b. Chemical: Our sweat contains antibacterial properties
c. Genetic: Some genes are more powerful to combat pathogens.
Work Step by Step
Three components of the first line of defense are:
a. Physical: Our skin acts as a physical barrier
b. Chemical: Our sweat contains antibacterial properties
c. Genetic: Some genes are more powerful to combat pathogens.