Select | | View | Download | | 6.1 Humans as heterotrophs | | |
| 6.2 Food requirements of humans | | |
| 6.3 Food tests | | |
| 6.4 Balanced diet | | |
| 6.1 Humans as heterotrophs (Bilingual) | | |
| 6.2 Food requirements of humans (Bilingual) | | |
| 6.3 Food tests (Bilingual) | | |
| 6.4 Balanced diet (Bilingual) | | |