What is the stage of early embryonic development where the cells aggregate together to form a single mass of cells where individual cells are no longer distinguishable.
Hormone produced by fetus in late gestation that crosses the placenta and initiates events of parturition?
Hormone produced by the cl and or placenta to dilate the birth conal in late gestaion in preparation for paturition
In which farm animal does the placenta produce enough progesterone in later gestation in order to maintain pregnancy