Answer:
it changed because they were changing their food.
Explanation:
I think its P<span>hytoplankton, I'm not sure.
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Answer:
Blackfoot, Arapaho, Assiniboine, Cheyenne, Comanche, Crow, Gros Ventre, Kiowa, Lakota, Lipan, Plains Apache (or Kiowa Apache), Plains Cree, Plains Ojibwe, Sarsi, Nakoda (Stoney), and Tonkawa.
The answer is B) The Aryans