Exciting Mechanistic Aspects of How Animals Reproduce through the Process of Gamete Fusion. Life Then Develops from on Cell to Multicellular Embryos. Postembryonic Development Will End with the Adults That Will Start Again the Ceycle of Reproduction through Sex. Some of the Topics: Fertilization, the Function of Micrornas in Development, the Formation of Reproductive Systems and Organs, Stem Cells Development, the Genetic Basis of Programmed Cell Death, the Molecular Basis of Sexual Behavior and Again.