Question: When all three germ layers are present (ectoderm, endoderm, and mesoderm), what event has occurred? a. Blastulation b. Limb formation c. Gastrulation d. Morulation

When all three germ layers are present (ectoderm, endoderm, and mesoderm), what event has occurred?
a. Blastulation
b. Limb formation
c. Gastrulation
d. Morulation

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