Question

what is your bodys first defense against external pathogens?
t cells
skin
stomach
b cells
rewatch

Explanation:

The body's first defense against external pathogens is a physical barrier. Skin acts as this primary barrier, blocking pathogens from entering the body. T cells and B cells are part of the adaptive immune system (later defenses), and "stomach" (likely a typo) is not the first line.

Answer:

skin