The exact outcome of the two processes depends both on the rate at which new mutations occur and on the strength of the natural selection, which is a function of how unfavourable the mutation proves to be.
Ittus wan tiditt n timitikwayen tin sanatat ilkam i iddikud wa s taj in imutiyan eynaynen tolas fal assahat n nefran n batil eqqalan alxidmat n immik wa s war ofa immik wa eqqal amutti