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.
Mac OS = could mean just Mac OS 9, or 1 through 8 and no Mac OS X. Mac OS X = could just mean 10.0, or it could mean all PowerPC Macs running 10.0, or all versions of Mac OS X. Mac OS X PPC = means G3, G4, and G5s may support it with 10.0 through 10.5.8, but no certainty exists which ones.