49:2.21

4. The temperature types. It is possible to create living beings who can withstand temperatures both much higher and much lower than the life range of the Urantia races. There are five distinct orders of beings as they are classified with reference to heat-regulating mechanisms. In this scale the Urantia races are number three. Thirty per cent of Satania worlds are peopled with races of modified temperature types. Twelve per cent belong to the higher temperature ranges, eighteen per cent to the lower, as compared with Urantians, who function in the mid-temperature group.