Three layers called the ectoderm, mesoderm, and endoderm form in the developing organism during the period of the

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The ectoderm, mesoderm, and endoderm are three germ layers that form during the developmental stage of the embryo, which is the period after the zygote has undergone several rounds of cell division and differentiation. The amnion and fetus refer to later stages of development, while the zygote is the earliest stage.

Three Layers Called the Ectoderm, Mesoderm, and Endoderm Form in the Developing