D. Greenhouse gas feddback
I'm not for sure but I believe this is the answer sorry if I get it wrong in advance
Answer:
B
Explanation:
because I know that this is right
Answer:
B.
Incomes in Wyoming and Arizona are relatively the same in comparison to the national average.
Explanation:
Hello There! ^_^
Your question: What were the three main Indian groups before European explorers arrived..?
Your answer: The Mayan, the Aztecs and the Incas were the three main Indian groups before European explorers arrived.
Hope this helps!