Onychogryphosis, also known as âramâs horn nails,â is a condition in which the toenails become thickened and the curve of the nails becomes more severe, making them difficult to cut and causing them to grow into a long, curved shape resembling a ramâs horn.
Scientific taxonomy. Basic level categories, or generic level categories, are those categories in a folk taxonomy which are most culturally salient, and meet our basic cognitive needs the best.cientific taxonomy. Basic level categories, or generic level categories, are those categories in a folk taxonomy which are most culturally salient, and meet our basic cognitive needs the best.
Levels A-F are elementary school levels. 1  Level A: Horizontal addition, Subtraction from numbers up to 20. 2  Level B: Vertical addition and subtraction. 3  Level C: Basic multiplication, division. 4  Level D: Long multiplication, long division, introduction to fractions. 5  Level E: Fractions. 6  Level F: Four operations of fractions, decimals.