The stage that occurs last in human development from the options provided is fetus.
The typical sequence of human development stages is as follows:
- Zygote (fertilized egg)
- Blastocyst (after the zygote divides and forms a hollow structure)
- Embryo (the developing organism up to about 8 weeks)
- Fetus (from about 9 weeks until birth)
Therefore, the fetus stage comes after the other stages.