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.
Eiffel Tower The French engineer Gustave Eiffel designed the Eiffel Tower. The tower, arguably the most well-known monument in the world, is the tallest structure in Paris. Iâ¦t was completed in 1889, and it has had several hundred million visitors since it opened.