George Strait has the most #1 hits at 57 and counting. Nobody else comes close. Conway Twitty actually had the most until 2006 with 55 #1 hits. The Beatles are the musical act with the most songs to reach No. 1 on the Billboard singles chart. Mariah Carey has 18 such #1 hits and Elvis Presley 17.
Primary succession begins on rock formations, such as volcanoes or mountains, or in a place with no organisms or soil. This creates conditions nearer optimum for vascular plant growth; pedogenesis or the formation of soil is the most important process.
In primary succession, bare rock or sand is the substrate upon which the pioneer species act. Primary succession occurs in places that are the result of lava flows or where glaciers have retreated. Soil is not yet present, so no plants or animals can survive in such a region.Pioneer species are the lichens and moss.