Sears, for example, has developed a response model based on weather, e.g. targeted emails on window AC units during a heat wave targeted at relevant zip codes 3-5 days after a heat wave.

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Fe wnaeth AC y Ceidwadwyr William Graham hefyd gwestiynu annibyniaeth y negeseuon e-bost.

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Fe wnaeth e hefyd ateb cwestiynau ar y gwasanaeth iechyd, diweithdra ymysg yr ifanc ac adroddiad y Comisiwn Silk.

BBC: Cwestiynau i'r prif weinidog