no because it is in the body
External defenses - Includes skin and mucous membranes. Internal defenses - Includes phagocytic cells, inflammatory responses, and antimicrobial proteins.
The gastroderm is the inner layer of cells that lines the gut or digestive cavity of cnidarians such as jellyfish and corals. It is involved in digestion, absorption of nutrients, and in some cases, defense mechanisms.
Earl's-defense is a system of fortifications for protection.
These lines are perpendicular: _|
4
when the first and the second lines of defense have already been overcome.
Railway tracks electrical lines
Yes it is a good line of defense.
Railroad tracks, the edges of a book, and the lines on a ruled notebook paper are real-world examples of parallel lines.
Fever
the lines of the brooklin bridge