A zygote is a a. two-celled embryo. c. blastocyst. b. solid ball of about 50 cells. d. fertilized egg.

D. Fertilized egg A zygote is a cell which is a diploid cell in the combination of the spem and egg cell. Furthermore, this cell which came from the parent cell was successfully fertilized at the fallopian tube of the female reproductive system. A zygote will develop to become an embryo for the next few weeks.