Bluetooth File Transfer is not just for copying files between two devices, you can also use it to edit, create, delete, move and rename files, either on your device, or another Bluetooth-enabled device, such as a PC, smartphone, PDA, or a music player.
Meaning and definition of bottleneck effect : Genetic drift resulting from the reduction of a population, typically by a natural disaster, such that the surviving population is no longer genetically representative of the original population.
Cheetahs suffered a population bottleneck at some point in their recent past. The near-extinction of the California condor. The remaining population (captive bred) are descended from only a handful of individuals. an example is the lack of smelter and refinery supply which cause bottlenecks upstream.