In history such as World History? You should be able to distinguish the trends and differences in different periods say "Period 1 vs. Period 2" where each period represents a different range of years (in AP World History I learned it with 6 periods but it varies from year to year of when it is taught)
<span>From what i remember in my test,
It was first unpopular because slavery was a economic contributor during that time i would have to say it was actually the most important thing at that time. Hope this helps!</span>
World human population reached one billion
I think it is A. Stretch a note for longer than its normal time value.
