Hunter-gathering tribes
small towns and nomadic groups
city-states and small kingdoms
empires
nation-states
B Leland Stanford or perhaps c but I'm pretty sure B
the system of electrons surrounding the nucleus of an atom. The name electron cloud is an informal way to describe an atomic orbital.
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Squanto, he directed the pilgrims how to set their corn, where to take fish and to procure other commodities." Also helped pilgrims negotiate a peace treaty with the Wampanoag people who lived nearby.
