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 !
The outer boundary of a plant cell is the cell wall.
Hadrian's Wall in Britain the Danube River in Continental Europe
A group of fourced villagers taken by the emperor comand to build a wall of protection over china.
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.
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.
Outer dynamic boundary is cell membrane. Outer boundary is cell wall
Berlin Wall and The Great Wall of China
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.
Plasma membrane A cell membrane, cellular envelope, or cell wall, depending on the type of cell.