After the two VRML worlds have finish loading, click and drag any piece of either object to separate it.
Neural: dark blue
Skin: light blue
Dorsal mesoderm: red
lateral mesoderm: dark red
ventral mesoderm: orange
endoderm: yellow
gut: pink
If you can not see the two objects, you may need a VRML plug-in.
I recommend: Cortona VRML client by Parallel Graphics.