最終更新日：2024/08/04
The three germ layers are the ectoderm, mesoderm, and endoderm.
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The three germ layers are the ectoderm, mesoderm, and endoderm.
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The three germ layers are the ectoderm, mesoderm, and endoderm.
The three germ layers are the ectoderm, mesoderm, and endoderm.
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