) one biological mother. And the format of the second argument-place of #$bodyTemperature is #$IntervalEntry because, while a given creature (at a given moment in time) has a single exact (see #$ScalarPointValue) body temperature, we want the predicate #$bodyTemperature to be flexible enough to allow us to specify this temperature with varying degrees of precision (e.g. as 98.6 degrees Fahrenheit or as between 98 and 99 degrees or as less than 100 degrees ). See the various instances of #$Format for further