Scientists trying to determine evolutionary relationships among organisms sometimes search for clues by examining how each organism develops from a fertilized egg cell. what name is given to the scientific study of how organisms develop from a single cell into independent living creatures?

The answer is Embroyology.  Scientists trying to determine evolutionary relationships among organisms sometimes search for clues by examining how each organism develops from a fertilized egg cell. The name given to the scientific study of how organisms develop from a single cell into independent living creatures is Embryology.  This is the study of living creatures starting from fertilization up to the development of an embryo.  It is the study of the formation and development of an embryo and fetus.