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Mac OS X is mostly written in Objective C utilising Apple's Cocoa frameworks (See links below). Some core aspects of the system are written in C. probably objective-C ... which is mac's version of C++ - which other opperating systems (and everything else) is written in ... and C of course, which is an older version of C++.
Though if you want to be technical, that code has to be compiled into Assembly language and or machine code - which the processor understands.
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