The Two main types of history data used in classification are

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Explanation:

because flatint of the curve is

Historical sources constitute the raw material of History. They include all documents, testimonies or objects that convey significant information to us regarding the events that have taken place, especially in the past. Within them, and considering the value that the others also have, the written sources are the basic support to build History.

The historian works with historical sources ("questions and contrasts them") to obtain as much information as possible from them. Likewise, it must attend to its variety, making an adequate selection of them. In a general sense, Historical Sources are of two types: primary and secondary.

Primary sources. They are those that have been developed practically at the same time as the events that we want to know. They come to us without being transformed by anyone; that is, as they were made at the time, without being subjected to any subsequent modification. Secondary sources. They are also called historiographic. They are those that are made from the primary sources: books, articles ...

Explanation:

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b. florence

d. milan

social contract theory, nearly as old as philosophy itself, is the view that persons' moral and/or political obligations are dependent upon a contract or agreement among them to form the society in which they liv