Committees are essential to the effective operation of legislative bodies. Committee membership enables members to develop specialized knowledge of the matters under their jurisdiction. As "little legislatures," committees monitor on-going governmental operations, identify issues suitable for legislative review, gather and evaluate information; and recommend courses of action to their parent body.
The Senate currently operates 24 of these fact-finding, consensus-building, policy-recommending panels. Although many are almost as old as the Senate itself, senators periodically update their jurisdictions and resources to meet the evolving demands of modern American life.
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The Colombian Exchange was an Exchange in between Native Americas and the colonizing Europeans. It saw the exchange of ideas (mostly from Europe), natural resources (such as crops), as well as diseases (which led to the demise of the native population).
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The answer is D. Providing more tools to make goods more quickly thereby increasing the output