What was the operating system OS X developed by?

Can a direct mapped cache sometimes have a higher hit rate than a fully associative cache with an LRU replacement policy? How do you make a movie file from a thumb drive show up and have picture and audio? What identifies software by specifying the directory path where the application is stored in the file system? How much is 1600 MB converted to GB? Are there resolution tools in the four basic tool categories in the Adobe Illustrator toolbox? How do you get a length of cube with given a volume? Where do the contents of an active cell always appear? How do you get a click in your neck? What of the fields on the data packet contains a message identifier? Adobe acrobat reader 4.0 download? Why touch pad mouse freezes on Compaq computer? How do people find free live wallpapers for their Android devices? What is an alias in place of a JPEG file? What is the theme of user friendly? If you have two drums one is three gallons and the other is five if you have an unlimited supply of water but need to get exactly four gallons how could you do it? Do any Apple products use Linux? Is there a way to use an mpc 500 as a trigger in pro tools 9? In Excel What Predesigned combinations of formats? Who is the author of oracle? Crooks tells Lennie he now knows why his old man didn't like his playing with white kids What does he now know?

What was the operating system OS X developed by?