Did any scientist check on variations due to such factors?

In some cases, data on genetic variations can be conflicting.

Another example was based on variations of the Pohlman cell.

She pulled down statistics on racial variation in beard growth.

This was not the time for an extended lecture on human physiological variation.

In one case the union concerned had balloted its members on several variations of industrial action.

In fact, its steps are based on complicated variations of fast and slow rhythms.

Reports on seasonal variation in range size have been equivocal.

She is most known for her work on grammatical variation in adolescent speech.

The seeing conditions depend on the turbulence and thermal variations in the air.