Making the world better, one answer at a time. The primary germ layers (endoderm, mesoderm, and ectoderm) are formed and organized in their proper locations during gastrulation. Endoderm, the most internal germ layer, forms the lining of the gut and other internal organs. Ectoderm, the most exterior germ layer, forms skin, brain, the nervous system, and other external tissues. Mesoderm, the the middle germ layer, forms muscle, the skeletal system, and the circulatory system.
Eiffel Tower. The Eiffel Tower, located in Champ de Mars in Paris, is a tall wrought-iron structure made by man. It is one of the most famous monuments of the world. It is the most famous landmark of Europe, held the record as the tallest man-made structure of the world from 1889 to 1930 with its height of 324 meters.
The tower was built as the theme structure of the Universal Exposition of 1889, which was held in Paris.The city originally signed a contract for an operating concession for 20 years, and after that (in 1909) the concession would revert back to the City of Paris.he Eiffel Tower was made out of 1808 pieces of puddled iron that were riveted together. The Eiffel Tower was built for the entrance for the World Exhibition, which was a celebration for the French Revolution. The Tower is now a national momentum of Paris.