Nina says that a newly fertilized egg cell cannot survive without nourishment from the mother. Carole says that the fertilized egg cell is nourished by the yolk of the ovum and gains mass before implantation. Sarah says that the fertilized egg cell only gains mass after implantation. Which person is correct

The newly fertilized egg gains mass only after it is implanted in the uterus wall. Before the implantation, there is no gain in the mass of the fertilized egg. Moreover, the nourishment is not derived from the cell of the uterus. A newly fertilized egg is capable of surviving without the nourishment from mother as long as the nourishment is provided in vitro. Hence, the statements of Nina and Carole are not right.

Hence, the answer is 'the statement of Sarah is correct'.