Ohn dalton believed that: atoms are made of mostly empty space. chemical changes are the result of different atomic combinations. violent chemical reactions can divide atoms into smaller particles. all of the above.

the results of roman expansion produced social conflict and civil war. julius caesar gained power and became a dictator but was then assassinated. the reign of augustus began a long period of imperial rule and peace in the roman empire. rome faced the problems of how to maintain peace, law, and order.

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an interest group is an organization whose members share common concerns, and try to influence government policies that impact those concerns. elected officials frequently complain about the influence of "special interests" on american politics.