Question
Which human organ system is the first to become visibly differentiated during development? Which is the second? What is the significance of this order?
Answers
PsyDAG
Embryology is the topic area you desire. Since this is not my area of expertise, I searched Google under the key words "<I>embryology 'organ systems' development</I>" to get these possible sources:
(Broken Link Removed)
http://www.niaaa.nih.gov/Resources/GraphicsGallery/FetalAlcoholSyndrome/Embryonic.htm
http://en.wikipedia.org/wiki/Embryology
(Broken Link Removed)
http://missinglink.ucsf.edu/lm/IDS_101_embryology_basics/CoreText.htm
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.
(Broken Link Removed)
http://www.niaaa.nih.gov/Resources/GraphicsGallery/FetalAlcoholSyndrome/Embryonic.htm
http://en.wikipedia.org/wiki/Embryology
(Broken Link Removed)
http://missinglink.ucsf.edu/lm/IDS_101_embryology_basics/CoreText.htm
In the future, you can find the information you desire more quickly, if you use appropriate key words to do your own search.
I hope this helps. Thanks for asking.