Complex organisms contain different levels of organization that work together to maintain homeostasis. Which statements correctly describe the roles of stem cells in maintaining a complex organism? Select ALL that apply. A An adult red blood stem cell can easily differentiate to become a nerve cell. B Stem cells are unspecialized cells that can become specialized during differentiation. C Stem cell differentiation is the only process needed to maintain a complex organism. D Stem cells become differentiated based on the different genes inherited by the organism. E Adult stem cells can replenish themselves with identical copies formed during cell division. F Adult stem cells are totipotent cells that can differentiate into any cell type needed for repair.