Misc: What is the stage name of George Alan O'Dowd?

Questions

In biology, the complex of processes by which living organisms originated on earth & have been diversified & modified through sustained changes in form & function?

In cartography, the ratio of the distance between two points on a map & the actual distance between the two points on the earth's surface?

In chemistry, analytical technique used for the chemical separation of mixtures & substances?

In chemistry, law stating that many of the physical & chemical properties of the elements tend to recur in a systematic manner with increasing atomic number?

brain, watching, bath, house?