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.
Measuring 300.5 meters (986 feet) in height and weighing in at 6,300 metric tons (7,000 tons), the Eiffel Tower is the most famous landmark in France. It was constructed during the period from 1887 to 1889 by the French civil engineer Gustave Eiffel (1832â1923), whose name the monument has always borne. The tower was originally intended to serve as the gigantic entrance gate for the 1889 Exposition Universelle, but it quickly took on a life of its own.