I think the answer is the settlers that was in Europe but I'm not sure.
<span>Primary reinforcer are naturally and occurring and do not require an individual to learn any significant method or process in order to work.They are backed by an evolutionary basis.They occur since beginning of time and aid survival species.</span>
Answer:
Mountains and bodies of water
Explanation:
Mountains and bodies of water protected empires as it was the mountains that served as a barrier that protected ancient China and was used as an invasion route by the Aryans into ancient India also water bodies provided agricultural facilities which helped in allowing the empires become more successful.
D. The appearance of the odd people
Answer:
Persia's standing army was an important factor in Persia's rapid growth because of the elite soldiers within the standing army. They were known as the "Immortals" and tasked to maintain order from within and the outside.
Explanation:
