List one derivative of (what comes from) the following germ layers: Mesoderm –   Endoderm –  

  Note the sperm cell at the bottom right. The layer at “A” is called the ______________________.

   What is a function of the organ at pointer A.

Name the layer at “C”.

  The hormone made by “A” is antagonistic to what other hormone?

   The grey cells at “B” are called _________________.

When does a secondary oocyte complete meiosis II?

  What is the function of the red structures at “A”.

  Identify the space indicated by the blue lines at “A”.

     Identify the entire structure above.