Final answer:
10th-stage and 14th-stage bleed air are supplied by Engine Bleed Air, which is part of the aircraft's bleed air system used for various functions including air conditioning and engine starting.
Step-by-step explanation:
The 10th-stage and 14th-stage bleed air is supplied by the Engine Bleed Air. These stages refer to the points at which air is bled from the engines' compressor sections for various uses within the aircraft. The bleed air system is crucial for several functions such as air conditioning, pressurization, ice protection, and to start engines. The Auxiliary Power Unit (APU) can also supply bleed air when the engines are not running, and an External Air Source can be used when the aircraft is on the ground and needs air supply without running the APU or engines. The RAM Air is used for cooling and is not pressurized like bleed air from the engines or the APU.