This packet continues the review of Cell Growth and Division and follows my first packet on Cell Growth and Division. The first packet reviewed general topics on Cell Growth and Division and The Process of Cellular Division. This packet continues the review of cell growth and division with sections three and four: 3.) Regulating the Cell Cycle and 4.) Cell Differentiation. Section 3, Regulating the Cell Cycle, includes topics on the idea of turning genes off and on. A basic discussion of internal and external regulators is included. A basic review of cancer is included as well. Section 4, Cell Differentiation, reviews the development of beginning with fertilization. A basic review of developmental biology and corresponding terminology is included. A detailed review of stem cells wraps up this packet. This packet corresponds to my regulating the cell cycle and cell differentiation presentation, that can be found in my store as well.