It's not yet been fully certified yet but the recently discovered bones are ..... to be those of the missing link.

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It's not yet been fully certified yet but the recently discovered bones are ..... to be those of the missing link. (*) credited (*) argued (*) required (*) believed

This is a companion discussion topic for the original entry at https://english.best/questions/5129,its-not-yet-been-fully-certified-yet-but-the-recently-discovered-bones-are-___-to-be-those-of-the-missing-link/