Final answer:
Barbed wire and concertina wire cannot serve as a protective barrier by simply uncoiling and laying it on the ground.
Step-by-step explanation:
The statement that barbed wire and concertina wire may serve as a protective barrier by simply uncoiling it and laying it on the ground is false. Barbed wire and concertina wire are designed to be installed as fencing to create a physical barrier. They are typically attached to posts or other structures to form a secure perimeter. When uncoiled and laid on the ground, they do not provide effective protection.
Barbed wire was invented in the 19th century and had a significant impact on the American West. It allowed settlers and ranchers to easily fence off land, leading to the end of free range grazing and conflicts among different groups. However, it was not intended to be used simply by uncoiling and laying it on the ground.