Learn Croatian: Učim o prirodi, odnosno biologija me jako zanima. - I am learning about nature, or rather, biology interests me a lot.

The word ili simply means 'or' and offers a choice between two completely different things. By contrast, odnosno acts as a bridge to clarify, refine, or specify what was just said. The speaker isn't choosing between nature and biology; they are using odnosno to say 'or more specifically' or 'that is to say'.

I want to say 'I am interested in biology'. Why is the sentence structured as biologija me jako zanima?

While you could technically say zainteresiran sam za biologiju, Croatian speakers overwhelmingly prefer the active construction where the topic does the interesting. Here, biologija is the subject in the nominative case doing the action, and me is the object in the accusative case receiving the interest. It literally translates to 'biology interests me'.

Since odnosno connects the clauses, why doesn't the enclitic me come right after it?

Many conjunctions like odnosno, i, a, and ali do not count as the first position for enclitics. The new clause essentially starts counting positions from the word biologija, making it the first element. Therefore, the enclitic me correctly takes the second position right after it.

Just to double-check, why is prirodi in the locative case rather than the accusative?