Final answer:
The function that combines lists and allows a single loop to compare them is the zip() function in Python.
Step-by-step explanation:
The function that combines lists and allows a single loop to compare them is the zip() function in Python.
This function takes two or more lists as arguments and returns a list of tuples, where each tuple contains the corresponding elements from the input lists.
For example, if you have two lists, list1 = [1, 2, 3] and list2 = [4, 5, 6], using the zip() function like this: result = zip(list1, list2) would return a list of tuples: [(1, 4), (2, 5), (3, 6)].