Describe the process that forms the primary germ layers and cite the layer that contributes to nearly all body systems
A) Gastrulation forms the primary germ layers from the embryonic disc. The endoderm contributes to nearly all body systems.
B) Gastrulation forms the primary germ layers from the embryonic disc. The mesoderm contributes to nearly all body systems.
C) Formation of the primitive streak gives rise to the primary germ layers. The ectoderm contributes to nearly all body systems.
D) Formation of the primitive streak gives rise to the primary germ layers. The endoderm contributes to nearly all body systems.
E) Gastrulation forms the primary germ layers from the embryonic disc. The ectoderm contributes to nearly all body systems.
Answer: B
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