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Anton [14]
3 years ago
14

The first line of defense involves which structure(s)? T-cells skin blood B-cells

Biology
2 answers:
WINSTONCH [101]3 years ago
4 0
The first line of defense is skin, since it is the epidermis (top layer of skin) that protects all internal fluids and structures.
Gemiola [76]3 years ago
3 0
Skin.
The first being the outer barrier like skin, the second being non-specific immune cells like macrophages and dendritic cells, and the third line of defense being the specific immune system made of lymphocytes like B- and T- cells.
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Hence, option B is correct

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