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Abraham Lincolon was an American statesman and lawyer who served as the 16th President of the United States from March 1861 until his assassination in April 1865.

Lincoln led the United States through the American Civil War—its bloodiest war and perhaps its greatest moral, constitutional, and political crisis.

A primary key is a special relational database table column or combination of columns designated to uniquely identify all table records. That is, A primary key is a column or set of columns in a table that uniquely identifies tuples (rows) in that table.

A primary key, also called a Primary Keyword.

Main Features Primary key are ::

It must contain a unique value for each row of data.

It cannot contain null values.

Allows for expansion or contraction of the trachea. Hence, so large masses of food can pass through the esophagus during swallowing.

All enzymes are proteins but all proteins are not enzymes since, enzymes are subset of proteins.

Thyroxin or Thyroxine is the thyroid hormone that regulates carbohydrate metabolism in the human body.