Khan Academy
2:11
Khan AcademyJeff Otjen
Khan Academy
Explore the formation of specific structures from the three primary germ layers - endoderm, mesoderm, and ectoderm - during early embryogenesis. Discover how endoderm cells shape our gastrointestinal and pulmonary systems, mesoderm forms muscles, skeletal system, and genitourinary tracts, and ectoderm creates skin, related structures, and the ...
2014年11月4日
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