I think it’s D. Sorry if I’m wrong.
some were revolutionary were u didn't have cars u had to walk by foot, horse, by boat to have transportation it wasn't easy n they had to do it for miles n miles now we look back as how transportation was even invented but it was now we have millions of ways of transportation ways doesn't matter from planes to technology, etc.
Many fled political and religious persecution. Others hoped to improve their condition by owning their own land or by participating in the fur trade. Some came as servants.
Answer:
decrease in sea levels
increase in vegetation
warmer global climate
Explanation:
This all helped in making human surivial easier.