The correct answer should be because they want to establish a sense of time passing by and things changing over the course of time. Each new era is influenced by the previous one so the way time passes is important because as time passes by things change and the historians monitor it and record it in a chronological order.
yeah must have been moulded, keep these things in a refrigerator.. you shouldn't keep it like that..
I would say C because they dont get the supplies we do here in America
3-6 month stage if I understood what you are asking correctly
