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It is greater in the tropics as a result of the warm climate and high primary productivity in the region near the equator. Tropical forest ecosystems cover less than one-fifth of Earth's terrestrial area and contain about 50% of the world's species. [2] There are latitudinal gradients in species diversity for both marine and terrestrial taxa. [3]
Sri Lanka's tourism industry is recovering, with tourism revenue reaching over $1.5 billion in the first half of 2024, a 78% increase year-on-year. Tourist arrivals also increased to 1. 01 million, up 62% from the same period in 2023. This growth is attributed to the government's proactive measures and improvements from SriLankan Airlines. [307]
University Hall was the first building on campus, built in 1873 and reconstructed in 1976. The proposal of a manufacturing and agriculture university in central Ohio was initially met in the 1870s with hostility from the state's agricultural interests and competition for resources from Ohio University, which was chartered by the Northwest Ordinance and Miami University. [8]
Evolution is the change in the heritable characteristics of biological populations over successive generations. [1] [2] It occurs when evolutionary processes such as natural selection and genetic drift act on genetic variation, resulting in certain characteristics becoming more or less common within a population over successive generations. [3]
Yellowstone National Park is a national park of the United States located in the northwest corner of Wyoming and extending into Montana and Idaho.It was established by the 42nd U.S. Congress through the Yellowstone National Park Protection Act and signed into law by President Ulysses S. Grant on March 1, 1872.
The region is the biggest high-tech manufacturing center in the United States. [79] [80] The unemployment rate of the region was 9.4% in January 2009 and has decreased to a record low of 2.7% as of August 2019. [81] But in April 2020, when unemployment was at its peak, it stood at 13.7% and has since fallen to 5.7% in July 2021. [82]
Philadelphia (/ f ɪ l ə ˈ d ɛ l f i. ə / ⓘ fill-ə-DEL-fee-ə), colloquially referred to as Philly, is the most populous city in the U.S. state of Pennsylvania [11] and the sixth-most populous city in the United States, with a population of 1,603,797 in the 2020 census.