But the findings of Dr. Thornton and his colleagues show that some aspects of evolution do occur solely by chance.

American black bears occur solely in the Americas.

Elections in Liberia occur solely at the national level.

Ketogenesis can occur solely from the byproduct of fat degradation: acetyl-CoA.

The selected versions of the genes occur solely in Europeans and are presumably responsible for pale skin.

Disqualification occurs solely at the referee's discretion and no fouled contestant is automatically entitled to such a result.

The explosives were rigged so that the explosion occurred solely in a southern, eastern, and western direction-away from the historic building.

People often think that evolution is a process that occurs solely through time.

Accountability is interactional because it does not occur solely within the individual.

Finally, the unit history of the 1st Battalion, 5th Field Artillery describes the war as occurring solely in 1818.