The period of Paleolithic North Americans
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The Paleoindian Period refers to a time approximately 12,000 years ago at the end of the last ice age when humans first appeared in the archeological record in North America. One of the original groups to enter what is now Canada and the United States was the Clovis culture.

Explanation:

ww1 weapons: tank. tanks were used for the first time in the first world war at the battle of the somme. they were developed to cope with the conditions on the western front. the first tank was called 'little willie' and needed a crew of 3.