A physical boundary.
Hadrian built the wall to mark the boundary of the empire and to prevent raids by the Scottish tribes.
ANSWER No they are not the only country as ancient Athens & the vatican did aswell !
A group of fourced villagers taken by the emperor comand to build a wall of protection over china.
Hadrian's Wall in Britain the Danube River in Continental Europe
The cell structure that forms the outer boundary of plant cells is the cell wall. It is a rigid, protective layer made up of cellulose that provides structural support and protects the cell from physical damage.
The outer boundary of a cell is called the cell membrane, and is composed of a phospholipid bilayer.
The outer boundary of a plant cell is the cell wall.
To build bookshelves on a wall, you will need to measure the space, choose the type of shelves you want, gather the necessary materials like wood and brackets, and then install the shelves securely onto the wall using a level and screws.
The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.The "limes" or fortified boundary lines across northern Britain are Hadrian's Wall and the Antonine Wall.
Berlin Wall and The Great Wall of China
Outer dynamic boundary is cell membrane. Outer boundary is cell wall
They build the Great wall in the 3rd century BC.