Mollisols primarily occur in the middle latitudes and are extensive in prairie regions such as the Great Plains of the US. Globally, they occupy ~7.0% of the ice-free land area. In the US, they are the most extensive soil order, accounting for ~21.5% of the land area. Mollisols are among some of the most important and productive agricultural soils in the world and are extensively used for this purpose. Mollisols are divided into 8 suborders: Albolls, Aquolls, Rendolls, Gelolls, Cryolls, Xerolls, Ustolls, and Udolls. Click here for more information about these suborders.
Simple Answer: James Watson and Francis Crick are credited with the first correct double-helix model of DNA structure published in 1953 in the journal Nature.
James Watson and Francis Crick explain how they solved the structure of DNA. I'm James Watson. I'm Francis Crick. In 1953, Francis and I published the first accurate model of the DNA molecule. We were interested in DNA â the hereditary molecule of life. We wanted to build on what was chemically known about DNA, and determine its actual structure.