Final answer:
Stem cells are unspecialized cells that can divide and differentiate into specialized cells. They can be categorized based on their potential to differentiate. Stem cells play a crucial role in renewing and repairing body tissues.
Step-by-step explanation:
ntial to differentiate. The ultimate stem cells are called totipotent stem cells, which can differentiate into any cell needed for an organism to grow and develop. Adult stem cells exist in most tissues and can divide and differentiate into specialized cells formed by that tissue, allowing the body to renew and repair tissues. Induced pluripotent stem cells, on the other hand, are promising because they can avoid legal, ethical, and immunological issues associated with embryonic stem cells.