Physics
Middle latitude cyclones are fueled by?

All of these
Energy from falling precipitation
Polar continental air masses
Air high in the atmosphere

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Physics
In a bipolar junction transistor

The base has the least concentration of impurity
The collector has the least concentration of impurity
All the three regions (the emitter, the base and the collector) have equal concentrations of impurity
The emitter has the least concentration of impurity

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