What does the embryo consist of at the gastrula stage? What is the name of the set of processes leading to the formation

What does the embryo consist of at the gastrula stage? What is the name of the set of processes leading to the formation of gastrula? What is the essence of gastrulation?

Gastrula is a two-layered embryo consisting of ectoderm and endoderm. The opening in the gastrula is called the gastropor (primary mouth). The process of gastrula formation is called gastrulation.



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