Which of the following is involved in cloning mammals? A - removing the nucleus of an unfertilized egg

B - A surrogate female to develope the embryo

C - somatic cell nuclear transfer

D - all of the above are correct

The answer is D, Both answers A and B are correct, so the answer must be D, all of the above. A is correct because the nucleus must be removed to insert the genetic material for the clone, and B is correct because there needs to be a surrogate mother to deliver the clone, no exceptions.