Dueg
Organ a geir yn y rhan fwyaf o fertebratau yw dueg, sy'n chwarae rôl bwysig iawn wrth lanhau a dinistrio hen gelloedd coch y gwaed a brwydro heintiau.
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| Enghraifft o'r canlynol | math o organ, dosbarth o endidau anatomegol  |
|---|---|
| Math | organ anifail, meinwe lymffatig, corticomedullary organ, blood forming organ, endid anatomegol arbennig |
| Rhan o | system imiwnedd |
 Ffeiliau perthnasol ar Gomin Wicimedia | |
Mae dueg dyn tua maint dwrn, a lleolir ar ochr chwith y corff, uwchben yr ystumog ac o dan yr asennau.
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