| Select | | View | Download | | 14.1 The human reproductive systems | | |
| 14.2 Sperms and ova | | |
| 14.3 Ovulation and menstruation | | |
| 14.4 Sexual intercourse and fertilization | | |
| 14.5 Development of embryo and foetus | | |
| 14.6 The birth process | | |
| 14.7 Parental care | | |
| 14.8 Birth control methods | | |
| 14.1 The human reproductive systems (Bilingual) | | |
| 14.2 Sperms and ova (Bilingual) | | |
| 14.3 Ovulation and menstruation (Bilingual) | | |
| 14.4 Sexual intercourse and fertilization (Bilingual) | | |
| 14.5 Development of embryo and foetus (Bilingual) | | |
| 14.6 The birth process (Bilingual) | | |
| 14.7 Parental care (Bilingual) | | |
| 14.8 Birth control methods (Bilingual) | | |