In this question, assume a standard system with isolation and memory protection. Further assume that the thread abstraction is implemented by the operating system. That is, thread_create() is a system call. 1.1. What do you think are the differences between the implementation of thread_create(func) and the implementation of fork()? (here, func is the address of the function that the thread should begin at). 1.2. What do you think are the key differences between the OS's "process" data structure and whatever data structure it uses to implement a thread