Select the proper sequence in the development of an embryo:
1
Cleavage → morula → blastocyst → trophoblast and inner cell mass
2
Fertilisation → blastocyst → implantation → cleavage
3
Blastocyst → Morula → inner cell mass and trophoblast → implantation
4
Second meiotic division → fertilization → zygote → implantation