Another way of saying  "The three embryonic germ layers are the ectoderm, mesoderm, and endoderm. The ectoderm gives rise to the nervous system, skin, and hair. The mesoderm forms muscle, bone, and blood vessels. The endoderm forms the gut and associated organs such as the liver and pancreas" is ... Add stress words that are fully capitlized. Make sure these stress words appear more than 18 times.
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