Please help me with all this 4 questions, thank you in advance

1. [3 points] Whose responsibility is to save the temporary registers when a procedure is called? 2. [3 points] Which procedures do not need to save the return ad dress? 3. [3 points] When can a recursive procedure be turned to an itera- tive? 4. [3 points] What makes the naive implementation of a 32 bit adder so slow