Examine the stages of embryo development shown below and ans…

Examine the stages of embryo development shown below and answer the three questions.  1.  What stage is represented by each letter (A is the …., B is the ….) 2.  List the order these stages would occur in from earliest to latest . 3. In image D, what is the name of the characteristic tube-like structure seen within the embryo?   Image A    Image B    Image C    Image D    Image E