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.
Named after its designer, engineer Gustave Eiffel, the Eiffel Tower is the tallest building in Paris. The structure was built between 1887 and 1889 as the entrance arch for t â¦ he Exposition Universelle, a World's Fair marking the centennial celebration of the French Revolution.