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.
The difference is that primary succession begins in a new environment, like bare rock; secondary succession begins in an area from which a pre-existing community has been removed, such as a burned-out forest.Source(s): Asst Prof Â· 6 years ago.Thumbs up.econdary Succession-succession that begins after a disturbance that has left some of the previous community intact-e.g. abiotic disturbance (i.e. fire and storms) or human disturbance (agriculture, forestry, development) Similarities: 1.