<prompt> Lifespan of fetal RBC is-Same as adult RBC14 of adult RBC12 of adult RBC23 of adult RBC  <response>: Ans. d 23 of adult RBCRef: Ganong, 25th edp.555Life span of fetal RBCs is 60 to 90 days. It is about 23rd of adult RBCs life span 