This issue is of particular concern to Jewish, Muslim, Hindu and Roman Catholic communities whose religious practice favours burial or cremation to take place as soon as possible after death.
Mae'r mater hwn o bryder arbennig i gymunedau Iddewig, Mwslimaidd, Hindŵaidd a Chatholig y mae eu hymarfer crefyddol yn ffafrio claddu neu amlosgi cyn gynted â phosibl ar ôl marwolaeth.