Identify the human development stage shown below as well as the related right place of its occurrence in a normal pregnant woman, and select the right option for the two together:
| Developmental stage | Site of occurrence | |
| 1. | Blastula | End part of fallopian tube |
| 2. | Blastocyst | Uterine wall |
| 3. | 8-celled morula | Starting point of fallopian tube |
| 4. | Late morula | Middle part of fallopian tube |
1. Chorion
2. Allantois
3. Yolk sac
4. Amnion