This undifferentiated embryonic structure then undergoes a phase of major cell migration called gastrulation, producing a gastrula with three separate germ layers: the endoderm, mesoderm, and ectoderm. Endoderm The endoderm is formed from cells that migrate toward the center of the developing gastrula.
The Eiffel tower is made of puddled iron. It is made up of steel in steel X's. The Eiffel Tower is made of iron. The Eiffel Tower is made of pure iron.
The Eiffel Tower is 1,063 feet tall. It stands as France's symbol in the world and the showcase of Paris. Designed by Gustave Eiffel, the tower was built for the 1889 Exposition Universelle in celebration of the 100th anniversary of the French Revolution.