Answer from cs61c-ax (Amanda Alfonso 15906918) for Question 2
THe benefits of using fixed-size chunks to allocate pages in the VM system are that you eliminate the need to find a contiguous block of memory to allocate a program and it makes the boundary between page number and offset invisible to programmers and compilers.

Bigger chunks are good for taking advantage of spatial locality and reduce the (very costly) miss rate.

Smaller chunks helps improve page tables.