Galaxy / Mondeo timing belts / chains??

Hi, I have a Galaxy 2.3 Zetec (1999) and a Modeo 2L Zetec / Duratec (2001) (Mk3).
Both are approaching 100K miles and 10 years old.
I've found various info on google but nothing definite - do these use belts or chains, and do they need replacing?
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