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The discipline of ecology typically traces its origin to the synthesis of Darwinian evolution and Humboldtian biogeography, in the late 19th and early 20th centuries. Equally important in the rise of ecology, however, were microbiology and soil scienceparticularly the cycle of life concept, prominent in the work Louis Pasteur and Ferdinand Cohn. The word ecology was coined by Ernst Haeckel, whose particularly holistic view of nature in general (and Darwin's theory in particular) was important in the spread of ecological thinking. In the 1930s, Arthur Tansley and others began developing the field of ecosystem ecology, which combined experimental soil science with physiological concepts of energy and the techniques of field biology. The history of ecology in the 20th century is closely tied to that of environmentalism; the Gaia hypothesis, first formulated in the 1960s, and spreading in the 1970s, and more recently the scientific-religious movement of Deep Ecology have brought the two closer together.

What did the work of Louis Pasteur and Ferdinand Cohn focus on?
Answer: the cycle of life concept
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Red, white, and black were the colors of the German Empire from 1870 to 1918, and as such they came to be associated with German nationalism. In the 1920s they were adopted as the colors of the Nazi flag. In Mein Kampf, Hitler explained that they were "revered colors expressive of our homage to the glorious past." The red part of the flag was also chosen to attract attention - Hitler wrote: "the new flag ... should prove effective as a large poster" because "in hundreds of thousands of cases a really striking emblem may be the first cause of awakening interest in a movement." The red also symbolized the social program of the Nazis, aimed at German workers. Several designs by a number of different authors were considered, but the one adopted in the end was Hitler's personal design.

During what time period did the German Empire use the colors red white and black?
Answer: 1870 to 1918
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In February 1925, the Cardinal Secretary of State Pietro Gasparri summoned him to the Vatican and informed him of Pope Pius XI's decision to appoint him as the Apostolic Visitor to Bulgaria (192535). On 3 March, Pius XI also named him for consecration as titular archbishop of Areopolis, Jordan. Roncalli was initially reluctant about a mission to Bulgaria, but he would soon relent. His nomination as apostolic visitor was made official on 19 March. Roncalli was consecrated by Giovanni Tacci Porcelli in the church of San Carlo alla Corso in Rome. After he was consecrated, he introduced his family to Pope Pius XI. He chose as his episcopal motto Obedientia et Pax ("Obedience and Peace"), which became his guiding motto. While he was in Bulgaria, an earthquake struck in a town not too far from where he was. Unaffected, he wrote to his sisters Ancilla and Maria and told them both that he was fine.

When did Pietro Gasparri summon him to the Vatican?
Answer:
February 1925