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.
Why was the Eiffel tower built. The Eiffel Tower is one of Parisâ most splendid sites and is one of the most popular places of pilgrimage for tourists visiting the French capital. It is an enduring site, located on the Left Bank (the southern side) of the River Seine, in the south-western part of Paris. The Eiffel Tower was built for the Universal Exposition of 1889, which Paris hosted that year. The tower itself was intended to be the theme structure of the exposition.