Learn Finnish: Vähemmistö, jonka osuus on pieni, on yhä tärkeä. - The minority, whose share is small, is still important.

Yes! Osuus means "share", "proportion", or "quota". It is derived from osa (part), which you use to build fractions like kolmasosa (one third). While osa is a simple piece, osuus typically refers to a calculated share or percentage of a whole.

Why is the relative pronoun jonka used here instead of just joka?

Jonka is the genitive (possessive) form of joka (who/which/that). It translates to "whose" in English. It points back to vähemmistö, so jonka osuus means "whose share" or "the share of which".

How is the word vähemmistö (minority) built?

It is built from the comparative word vähemmän (less). The suffix -istö is added to create collective nouns, which are words for groups of people or things. The exact opposite is enemmistö (majority), built from enemmän (more).

Could I use vielä instead of yhä for "still"?