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ToddTek ToddTek
wrote...
11 years ago
helpp me pleaseee
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wrote...
11 years ago
I think they are the ectoderm, mesoderm, and endoderm.
wrote...
11 years ago
this is correct- tissue "determination" doesn't take place until gastrulation, where cells "invaginate" into the blastopore to create a 3D ball; endodermal cells form the future gut, mesoderm forms the skeleton and connective tissue, and ectoderm forms the skin (and nervous tissue when stimulated by morphogens such as chordin and noggin)
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