Germ development in embryogenesis
During embryogenesis, diploblasts develop two embryonic germ layers: an ectoderm and an endoderm. Triploblasts develop a third layer, the mesoderm, between the endoderm and ectoderm
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"OpenStax College, Biology. November 16, 2013."
http://cnx.org/content/m44656/latest/?collection=col11448/latest
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