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 in 1889 and served as the entrance to the World's Fair that year. It is an iron lattice tower named after Gustave Eiffel, the engineer whose company designed and built the Eiffel Tower. It's located in Paris on the Champ de Mars.