explain how the two defining characteristics of stem cells enable them to be used to replace damaged or diseased tissue so that the new tissue functions are opposed to forming a scar

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

its probably to later but whats the question