In this task, you're given a question, along with three passages, 1, 2, and 3. Your job is to determine which passage can be used to answer the question by searching for further information using terms from the passage. Indicate your choice as 1, 2, or 3.

Question: Is there a high aboriginal population in Innamincka? Passage 1:Following Operation Barbarossa, the German invasion of the Soviet Union in June 1941, and the entry of the United States into World War II in December 1941, the Soviet Union became a less attractive patron for Sheng than the Kuomintang. By 1943 Sheng Shicai switched his allegiance to the Kuomintang after major Soviet defeats at the hands of the Germans in World War II, all Soviet Red Army military forces and technicians residing in the province were expelled, and the Republic of China National Revolutionary Army units and soldiers belonging to Ma Bufang moved into Xinjiang to take control of the province. Ma Bufang helped the Kuomintang build roads linking Qinghai and Xinjiang, which helped both of them bring Xinjiang under their influence. At August 1942 Sheng met Dekanozov, former Soviet ambassador to Nazi Germany and Vice Commissar of the Ministry of Foreign Affairs of the USSR, in Ürümqi and demanded that the Soviet Union withdraw all military forces and political officers from Xinjiang in three months and remove all Soviet equipment from the territory of Soviet Concessions, including closing the Soviet oil fields in Tushangze (Jungaria) and the Soviet Aircraft Manufacturing Plant in Ürümqi. On 29 August 1942, the day after Dekanozov left Ürümqi, Sheng met Madame Chiang Kai-shek, wife of the Chinese Generalissimo, who flew to Ürümqi with a letter from Chiang Kai-shek promising his forgiveness to Sheng for all of his previous deals. Sheng was appointed the head of the Kuomintang branch in Xinjiang in 1943 and allowed Kuomintang cadres into the province. To forge his ties with Kuomintang, on 17 September 1942 Sheng arrested a number of Chinese communists sent to Xinjiang by the Central Committee of the Communist Party of China in 1938 and executed them in 1943. Among the executed was Mao Zemin, brother of Mao Zedong. In the summer of 1944, following the German defeat on the Eastern Front, Sheng attempted to reassert control over Xinjiang and turned to the Soviet Union for support again. He arrested a number of Kuomintang cadres in Ürümqi and sent a letter to Stalin offering to "incorporate Xinjiang into USSR as its 18th Soviet Socialistic Republic." Sheng Shicai asked Stalin for the post of ruler of the new Soviet Republic. Stalin refused to deal with Sheng and forwarded the confidential letter to Chiang Kai-shek. As a result, the Kuomintang removed him from the province in August 1944 and appointed him to a low-level post in the Ministry of Forestry in Chongqing.
 Passage 2:The oldest true fossils of baleen are only 15 million years old because baleen rarely fossilizes, and scientists believe it originated considerably earlier than that. This is indicated by baleen-related skull modifications being found in fossils from considerably earlier, including a buttress of bone in the upper jaw beneath the eyes, and loose lower jaw bones at the chin. Baleen is believed to have evolved around 30 million years ago, possibly from a hard, gummy upper jaw, like the one a Dall's porpoise has; it closely resembles baleen at the microscopic level. The initial evolution and radiation of baleen plates is believed to have occurred during Early Oligocene when Antarctica broke off from Gondwana and the Antarctic Circumpolar Current was formed, increasing productivity of ocean environments. This occurred because the current kept warm ocean waters away from the area that is now Antarctica, producing steep gradients in temperature, salinity, light, and nutrients, where the warm water meets the cold.
 Passage 3:The Coongie Lakes is a freshwater wetland system located in the Far North region of South Australia. The lakes system is located approximately north of the Adelaide city centre. The wetlands includes lakes, channels, billabongs, shallow floodplains, deltas, and interdune swamps. It lies on the floodplain of Cooper Creek, an ephemeral river flowing through a desert landscape in the Lake Eyre Basin which rarely, after occasional large floods, empties into Lake Eyre. The wetland system has been recognised both as being of international importance by designation under the Ramsar Convention with a listing on 15 June 1987 and being nationally important within Australia with a listing in A Directory of Important Wetlands in Australia (DIWA). Its extent includes the regional town of Innamincka, the Malkumba-Coongie Lakes National Park, the Innamincka Regional Reserve, the Strzelecki Regional Reserve and the Coongie Lakes Important Bird Area.
3