What are the three germ layers of a gastrula?

Answer:
From inner to outer, the germ cell layers are the endoderm, mesoderm, and ectoderm.

Each of the three layers develops into a different part of the embryo: the endoderm into the respiratory, auditory, and digestive system; the mesoderm into the skeleton and muscles; and the ectoderm into the skin, tooth enamel, and nervous system.
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