Answer:
1. Hydrogen, 2. A solar nebula collapsed and formed the sun, and 3. 450 B.C.
Explanation:
None of the Plains tribes were originally Plains tribes - they all migrated into the Great Plains when horses became available. Living on the vast, empty grasslands was almost impossible without horses, which made following the herds a practicable lifestyle.
Previously most of the Plains tribes had lived in the northern woodlands or east of the Missouri river
325.7 million (2017)
326,766,748 (2018)
Answer:
Plattsburgh is the correct answer
