49:5.17

While the three-brained peoples are capable of a slightly higher planetary evolution than either the one- or two-brained orders, all have the same type of life plasm and carry on planetary activities in very similar ways, much as do human beings on Urantia. These three types of mortals are distributed throughout the worlds of the local systems. In the majority of cases planetary conditions had very little to do with the decisions of the Life Carriers to project these varied orders of mortals on the different worlds; it is a prerogative of the Life Carriers thus to plan and execute.