[Solved] All other things equal, it is profitable to continue processing a joint product after the split-off point so long as the incremental revenue from further processing exceeds the incremental costs of further processing. Naked Mole Rat: A small rodent from the Horn of Africa, known for its eusocial behavior, where individuals live in large colonies with a single breeding queen. Circadian Rhythm: A natural, internal process that regulates the sleep-wake cycle and repeats roughly every 24 hours. Adaptive Significance: Refers to the beneficial features of traits that have evolved through natural selection to solve specific problems in an organism's environment. Constant Light (LL): An environmental condition in which organisms are exposed to uninterrupted light, used in research to study circadian rhythms and biological clocks.