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 (/ËaÉªfÉl ËtaÊÉr/ EYE-fÉl TOWR; French: tour Eiffel [tuÊâ¿ÉfÉl] listen) is an iron lattice tower located on the Champ de Mars in Paris, France.It was named after the engineer Alexandre Gustave Eiffel, whose company designed and built the tower.he tower has three levels for visitors, with restaurants on the first and second. The third level observatory's upper platform is 276 m (906 ft) above the ground, the highest accessible to the public in the European Union.