Two recursive calls in a Merge Sort function confusion

Question

I have been out of touch with Algorithms for a while and have start revising my concepts these days. To my surprise the last i remember of my recursions skill was that i was goo

Answer 1

The indentation in the following corresponds to the recursion:

mergesort(0, 7)
    middle=3
    "Before the 1st Call"
    mergesort(0, 3)
        middle=1
        "Before the 1st Call"
        mergesort(0, 1)
            middle=0
            "Before the 1st Call"
            mergesort(0, 0)
                (0 < 0) is false so return
        "After the 1st Call"
        mergesort(1, 1)
            (1 < 1) is false so return
        "After the 2nd Call"

        etc ...