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 is a great structure located in Paris that towers above the low lying houses in this capital. This tower has been named after its designer called Gustave Eiffel and even today it is the tallest structure within Paris which is at 1,063 feet.