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Cadwraeth
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| Enghraifft o'r canlynol | disgyblaeth academaidd, mudiad cymdeithasol  |
|---|---|
| Math | moeseg amgylcheddol, amddiffyn yr amgylchedd |
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Pwrpas cadwraeth yw cadw iechyd yr amgylchedd a'u forestydd, pysgodfeydd, cynefynoedd, biosfferau a bioamrwyiaeth.
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