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.
Report Abuse. DNA structure DNA structure was first described by James Watson and Francis Crick in 1953. Deoxyribonucleic acid (DNA) is a nucleic acid that contains the genetic instructions for the development and function of living organisms.All living things contain DNA, with the exception of some viruses with RNA genomes.he nucleotides are joined in such a way that they form a double helix that is like a twisted rope ladder. The steps of the ladder are made by the paired nitrogen bases of opposing nucleotides. A-T and C-G The sides of the ladder are alternating sugars and phosphates.