I think it's Dia de Los Reyes
Answer:
1a : the basic principles and laws of a nation, state, or social group that determine the powers and duties of the government and guarantee certain rights to the people in it. b : a written instrument embodying the rules of a political or social organization.
Biology is the correct answer
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The prompt cause was the death of Franz Ferdinand, the archduke of Austria-Hungary. His demise on account of Gavrilo Princip – a Serbian patriot with binds to the undercover military gathering known as the Black Hand – pushed the real European military forces towards war.