[allmendream]

Searching a design space = trying out random DNA variations to see which ones are favored by selection.

Potential alternatives = mutated DNA of a gene that produces a protein that helps overcome the stress.

Outcome = higher mutation rate increases amount of genetic variation that is selected from by environmental pressure; i.e. evolution through natural selection of genetic variation.

[GourmetDan]

"Outcome = higher mutation rate increases amount of genetic variation that is selected from by environmental pressure; i.e. evolution through natural selection of genetic variation."

That explanation is no more empirical than the origin I proposed. Both are philosophically-based. Neither is empirical. Do you understand?