According to Beatty (1986), population genetics defines the core of the modern synthesis. In the first few decades of the 20th century, most field naturalists continued to believe that Lamarckian and orthogenic mechanisms of evolution provided the best explanation for the complexity they observed in the living world.
The Netherlands has been a constitutional monarchy since 1815 and a parliamentary democracy since 1848. Previously, it was a republic from 1581 to 1806, and a kingdom between 1806 and 1810 (it was part of France between 1810 and 1813).
Educational Videos, Lessons and Games for K-12 School Kids. Democracy is a type of government in which the people of a country hold the power to rule by electing representatives. In modern democracies, the legislature, composed of people's representatives, is elected by popular suffrage. The executive head of government is either directly elected by the people, or chosen by the legislature according to the country's legal procedures. Certain social liberties such as freedom of speech and political expression, and a free press are essential precursors to democracy.