From 1787 until 1913, the U.S. Constitution specified that state legislatures would elect U.S. senators. Article 1, Section 3, reads: The Senate of the United States shall be composed of two Senators from each State, chosen by the Legislature thereof, for six Years; and each Senator shall have one Vote.he Seventeenth Amendment, which was ratified in 1913, provided for the direct election of U.S. senators by citizens.
The physical breakdown of food is a physiological process known as digestion. To benefit your body, the foods you eat must be broken down so the nutrients they contain can move from your gut through the cells of your intestines and into your bloodstream.
Mechanical digestion involves physically breaking the food into smaller pieces. Mechanical digestion begins in the mouth as the food is chewed. Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells.Chemical digestion begins in the mouth when food mixes with saliva. Saliva contains an enzyme (amylase) that begins the breakdown of carbohydrates.(An enzyme is a protein that can catalyze certain biochemical reactions).echanical digestion involves physically breaking the food into smaller pieces. Mechanical digestion begins in the mouth as the food is chewed. Chemical digestion involves breaking down the food into simpler nutrients that can be used by the cells.