Yr uned iechyd

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1.
alcohol
2.
ysmygu
3.
nicotin
4.
tar
5.
cyffuriau
6.
ymennydd
7.
calon
8.
afu
9.
gordewdra
10.
effaith
11.
cymdeithas
12.
gwaed
13.
canser
14.
ysgyfaint
15.
cilia