Answer from cs61c-ar (Albert Chung 15826273) for Question 2
By having pages in fixed-size chunks, we eliminate the need to find a contiguous block of memory to allocate to a program; instead, the operating system can calculate the number of pages needed and only needs to find a sufficient number of pages in main memory.  With bigger chunks, there's less chance of incurring a page fault, but with smaller chunks, there's a smaller miss penalty and faster access time.