The purpose of scientific advice is to provide an overview of what we know and what can be inferred indirectly from the evidence base or by a consensus of expert opinion.
Diben cyngor gwyddonol yw rhoi trosolwg o beth ry'n ni'n ei wybod a beth ellir ei gasglu'n anuniongyrchol o'r dystiolaeth neu drwy gonsensws barn arbenigol.