In the nucleus that where the dna is
Rivers allowing for productive agriculture were the key factor in the settling of cities. Mountain ranges kept cultures in separate areas, providing natural barriers to imperialist agendas. The rich, fertile soil of the Middle East led early civilizations to settle, domesticate plants and animals, and thrive.
Do not take word for word
Hello there!
A credit is basically one school year (the amount of time it takes for you to acquire a credit for that class).
Hope I helped!
Let me know if you need anything else!
~ Zoe