Yeasts are single-celled microorganism.
I read the above in one of the YouTube videos.
Why can't we say "single-cell" microorganism?
How do we know that we need the past participle (celled) in order to form compound adjective?
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The following forms are used:
unicellular
single-cell
single-celled
You can see when these organisms were discovered as well as the best adjective to use: