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.
Only Slightly ;) Blackpool Tower is made from Iron and Steel which is rigid. It is designed so the wind passes straight through the structure and cause little or no sway at aâ¦ll. 6 people found this useful.