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https://carlam.cymru/videos/cemeg-safon-uwch-gwanwyn-2021-sesiwn-1/ Uned 3.8 - Cysonion ecwilibria | Carlam Cymru Jul 30, 2025 - Safon Uwch Cemeg Uned 3.8 – Cysonion ecwilibria uned cysonion cymru