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 |
| I: | The embryo’s heart is formed | After one month of pregnancy |
| II: | Limbs and external genital organs are well-developed |
By the end of the second month of pregnancy |
| III: | First movements of the foetus | During the fifth month |