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 was built by Gustave Eiffel in  1889 for the Exposition Universelle; the Eiffel Tower is 300 m/984  ft tall. At the time it was built, it was the world's taâ¦llest  free-standing structure.  It was built as the entrance to the Paris world's fair. 4 people found this useful.