发布网友 发布时间:2023-09-25 12:14
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热心网友 时间:2024-11-16 08:41
The rearrangement of the blastula into a three-dimensional organismwith inner, middle, and outer layers occurs ring gastrulation. The resulting gastrula consists of an outerectoderm, an inner endoderm, and a mesoderm layer positioned between them.