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  2. List of animal classes - Wikipedia

    en.wikipedia.org/wiki/List_of_animal_classes

    The following is a list of the classes in each phylum of the kingdom Animalia. 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 ...

  3. Cavalier-Smith's system of classification - Wikipedia

    en.wikipedia.org/wiki/Cavalier-Smith's_system_of...

    [10] [11] The taxa "animal kingdom" (or kingdom Animalia) and "plant kingdom" (or kingdom Plantae) remain in use by some modern evolutionary biologists. The initial targets of Cavalier-Smith's classification, the protozoa were classified as members of the animal kingdom, [12] and many algae were regarded as part of the plant kingdom. With ...

  4. Animal - Wikipedia

    en.wikipedia.org/wiki/Animal

    Over 1.5 million living animal species have been described, of which around 1.05 million are insects, over 85,000 are molluscs, and around 65,000 are vertebrates. It has been estimated there are as many as 7.77 million animal species on Earth. Animal body lengths range from 8.5 μm (0.00033 in) to 33.6 m (110 ft).

  5. 101 Science Trivia Questions and Answers To Test Your ... - AOL

    www.aol.com/lifestyle/101-science-trivia...

    Related: 324 Best Trivia Questions and Answers to Jumpstart Your Fun Game Night. 101 Best Science Trivia Questions. 1. Question: At what temperature are Celsius and Fahrenheit equal? Answer: -40 ...

  6. Taxonomic rank - Wikipedia

    en.wikipedia.org/wiki/Taxonomic_rank

    There are seven main taxonomic ranks: kingdom, phylum or division, class, order, family, genus, and species. In addition, domain (proposed by Carl Woese ) is now widely used as a fundamental rank, although it is not mentioned in any of the nomenclature codes, and is a synonym for dominion ( Latin : dominium ), introduced by Moore in 1974.

  7. Bird - Wikipedia

    en.wikipedia.org/wiki/Bird

    Birds are solely gonochoric, [101] meaning they have two sexes: either female or male. The sex of birds is determined by the Z and W sex chromosomes, rather than by the X and Y chromosomes present in mammals. Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ). [78]

  8. Umbellula - Wikipedia

    en.wikipedia.org/wiki/Umbellula

    This page was last edited on 22 October 2023, at 14:53 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may apply.

  9. Macropodiformes - Wikipedia

    en.wikipedia.org/wiki/Macropodiformes

    The Macropodiformes / m æ k r oʊ ˈ p ɒ d ɪ f ɔːr m iː z /, also known as macropods, are one of the three suborders of the large marsupial order Diprotodontia.They may in fact be nested within one of the suborders, Phalangeriformes. [2]