| Part of speech | unknown part of speech |
|---|
| Singular | Plural | |
|---|---|---|
| Nominative | biologia | biologiaj |
| Accusative | biologian | biologiajn |
| Danish | biologisk |
|---|---|
| Dutch | biologisch |
| English | biological |
| French | biologique |
| German | biologisch |
| Greek | βιολογικός |
| Icelandic | lífræðilegur |
| Portuguese | biológico |
| West Frisian | biologysk |