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. The Eiffel Tower (or as it is called in French: âLa tour Eiffelâ) is a tall iron tower located on the Champ de Mars in Paris. Around the time of its construction in 1889, many Parisians criticized the Eiffel Tower as unsightly with its steel girders and odd shape.