Plants are multicellular, eukaryotes organisms. They have membrane-bound organelles. A plant cell has a rigid cell wall, a central vacuole, plasmodesmata and plastids, which make it unique among all other type of eukaryotes cells.Plant cells sustain the photosynthesis process, during which oxygen is produced.lants are multicellular, eukaryotes organisms. They have membrane-bound organelles. A plant cell has a rigid cell wall, a central vacuole, plasmodesmata and plastids, which make it unique among all other type of eukaryotes cells.
During the Qin Dynasty, some of these early fortifications along the northern frontier would become part of the âfirstâ Great Wall. In 215 BC, the First Emperor Qin Shi Huang ordered his general Meng Tian to start constructing the Great Wall to protect against the northern nomads.
The Great Wall of China, in Shanhaiguan. The Great Wall of China is an ancient wall in China. The wall is made of cement, rocks, bricks, and powdered dirt. It was built to protect the north of the empire of China from enemy attacks. It is the longest structure humans have ever built.