Which Result Did Hans Spemann Get When He Bisected a Salamander

Which result did Hans Spemann get when he bisected a salamander zygote, isolating the gray crescent in one of the two resulting cells?

A) Both halves developed into complete embryos.
B) The half with the gray crescent developed into a belly piece, and the other half formed a complete embryo.
C) Neither half developed.
D) The half with the gray crescent developed into a complete embryo, and the other half formed a belly piece.
E) The half with the gray crescent developed into a complete embryo with a secondary embryo attached to its belly region.

Correct Answer:

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