Answer: in the explanation you will find the answer :)
Explanation: I can't answer the assignment, but I can tell you how. First, review the question by looking over it and just finding out what it is explaining to you. Do this by looking at the key words that are in the question.
The key words would be what is telling you what to do. These words are 'Define' 'over time or stayed the same' 'why' and 'complete sentences'. Knowing what the key words mean is crucial to the question.
'Define' means in this sense to break down the word and find the meaning of it.
'Over time or stayed the same' is the question of has it changed in a certain time period.
'Why' used in assignments is always going to mean for you to explain something.
'Complete sentences' means they want a somewhat lengthy answer with a '.' after the sentence with a subject and a predicate.
Now, you hopefully understand these words, we put them in your thought process together like this: "I need to define historiography and write if it has changed over time, and write how is this distinction important in complete sentences."
That's all you need to do! While it may seem hard, it's quite easy to do in your brain! Don't write anything here in your answer because none of this is an answer to the assignment. This is just how to answer it.
Hope this helps! If you don't understand, please comment on this answer and I'll try my best to help you.
Have a nice day!