blockers at the net.
skin is the first defense.
to be clean
You can perform self defense against someone on their property as long as they attacked you first and you are in danger.
Counter-terrorism Intelligence is often the first line of defense against terrorism in the US and other nations.
hvj
It is the first line of defense against pathogens.
The first line of defense against a pathogen would be barriers. Ex. The skin, Breathing Passages, and The Mouth and stomach.
Your skin is the first line of defense.
Your skin is the first line of defense.
The integumentary system is one of the first lines of defense against infection. It provides a physical and chemical barrier against the entry of pathogens.
Volleyball was first played in 1896.
A barrier... in humans that would be your skin.