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).
  Spain is a democracy with a parlimetary government under a constitutional monarchy. The European country of Spain holds the form of government known as  Constitutional â¦ Monarchy.They have monarchs, but they have no  executive role, they are their representatives in formal  ceremonies.n the 1930s, Spain had a parliamentary democracy. It was called the Second Republic. The Second Republic was put in jeopardy by the Spanish Civil War in 1936-1939 and overthr â¦ own at the wars end by the Nationalists under Franco who established a Fascist State.