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  2. List of animal classes - Wikipedia

    en.wikipedia.org/wiki/List_of_animal_classes

    There are 107 classes of animals in 33 phyla in this list. However, different sources give different numbers of classes and phyla. For example, Protura, Diplura, and Collembola are often considered to be the three orders in the class Entognatha. This list should by no means be considered complete and authoritative and should be used carefully.

  3. Trapezoid - Wikipedia

    en.wikipedia.org/wiki/Trapezoid

    The angle between a side and a diagonal is equal to the angle between the opposite side and the same diagonal. The diagonals cut each other in mutually the same ratio (this ratio is the same as that between the lengths of the parallel sides). The diagonals cut the quadrilateral into four triangles of which one opposite pair have equal areas ...

  4. Trapezius - Wikipedia

    en.wikipedia.org/wiki/Trapezius

    The trapezius muscle resembles a trapezium, also known as a trapezoid, or diamond-shaped quadrilateral. The word "spinotrapezius" refers to the human trapezius, although it is not commonly used in modern texts. In other mammals, it refers to a portion of the analogous muscle.

  5. Taxonomic rank - Wikipedia

    en.wikipedia.org/wiki/Taxonomic_rank

    These differences arise because there are few available ranks and many branching points in the fossil record. Within species further units may be recognised. Animals may be classified into subspecies (for example, Homo sapiens sapiens , modern humans) or morphs (for example Corvus corax varius morpha leucophaeus , the pied raven).

  6. Rhombus - Wikipedia

    en.wikipedia.org/wiki/Rhombus

    Using congruent triangles, one can prove that the rhombus is symmetric across each of these diagonals. It follows that any rhombus has the following properties: Opposite angles of a rhombus have equal measure. The two diagonals of a rhombus are perpendicular; that is, a rhombus is an orthodiagonal quadrilateral. Its diagonals bisect opposite ...

  7. 12 Incredible Reindeer Facts for Christmas - AOL

    www.aol.com/12-incredible-reindeer-facts...

    The post 12 Incredible Reindeer Facts for Christmas appeared first on A-Z Animals. Show comments. Advertisement. Advertisement. Holiday Shopping Guides. See all. AOL.

  8. Parallelogram - Wikipedia

    en.wikipedia.org/wiki/Parallelogram

    If it also has exactly two lines of reflectional symmetry then it must be a rhombus or an oblong (a non-square rectangle). If it has four lines of reflectional symmetry, it is a square. The perimeter of a parallelogram is 2(a + b) where a and b are the lengths of adjacent sides.

  9. McDonald's E. coli crisis reveals why vegetable contamination ...

    www.aol.com/news/mcdonalds-e-coli-crisis-reveals...

    E. coli is a normal pathogen in the guts of animals. Cattle have it more than others, but it has also been detected in geese, boars, deer and others, said Mansour Samadpour, a food safety specialist.