Identify the gastrula stage. The embryo is now somewhat asymmetrical because one side of the blastula has been pushed in

Identify the gastrula stage. The embryo is now somewhat asymmetrical because one side of the blastula has been pushed in

Identify the gastrula stage. The embryo is now somewhat asymmetrical
because one side of the blastula has been pushed in (invaginated). This process
involves unequal cell division with some migration of cells. In the early gastrula
stage, there is only a slight indentation where the invagination is, but in later
stages, the invagination continues until the pushed-in side reaches the opposite
side, thus forming a two-walled sac. The new cavity is called the archenteron, and
its opening to the outside is the blastopore. The outer layer of cells of the
gastrula is called the ectoderm; the inner layer which forms the archenteron is
called the endoderm. The ectoderm will give rise to the epithelium which covers

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