Plant fibers usually consist of structural carbohydrates such as cellulose in cell walls. Composed of repeating glucose units in long, single strands, cellulose cannot be digested by enzymes in the human intestine. Other plant fiber components include hemicellulose and pectin.
Mac OS is characterized by its monolithic system. From its original release through System 4, it ran only one application at a time. Even so, it was noted for its ease of use. Mac OS gained cooperative multitasking with System 5, which ran on the Macintosh SE and Macintosh II.
You can also start your Mac from OS X Recovery or Internet Recovery if your Mac was manufactured after 2011. To start your Mac from the Recovery System, use these steps: 1  Start up or restart your computer. 2  Hold down the Command and R keys on your keyboard until you see the Apple logo appear onscreen.