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  2. Ivory - Wikipedia

    en.wikipedia.org/wiki/Ivory

    Ivory is a hard, white material from the tusks (traditionally from elephants) and teeth of animals, that consists mainly of dentine, one of the physical structures of teeth and tusks. The chemical structure of the teeth and tusks of mammals is the same, regardless of the species of origin, but ivory contains structures of mineralised collagen ...

  3. 50 Animals So Giant It’s Hard To Believe They’re ... - AOL

    www.aol.com/85-photos-animals-way-bigger...

    Fun fact: blue whales are 16 times bigger than a human. The post 50 Animals So Giant It’s Hard To Believe They’re Real (New Pics) first appeared on Bored Panda.

  4. Hardnesses of the elements (data page) - Wikipedia

    en.wikipedia.org/wiki/Hardnesses_of_the_elements...

    Mohs hardness of materials (data page) Vickers hardness test; Brinell scale This page was last edited on ...

  5. Lists of animals - Wikipedia

    en.wikipedia.org/wiki/Lists_of_animals

    Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5 millionths of a metre to 33.6 metres (110 ft) long and have complex interactions with each other and their environments, forming intricate food webs.

  6. Arthropod exoskeleton - Wikipedia

    en.wikipedia.org/wiki/Arthropod_exoskeleton

    In some groups of animals, most conspicuously the Crustacea, the matrix is greatly enriched with, or even dominated by, hard minerals, usually calcite or similar carbonates that form much of the exoskeleton. In some organisms the mineral content may exceed 95%.

  7. Euryhaline - Wikipedia

    en.wikipedia.org/wiki/Euryhaline

    An example of a euryhaline fish is the short-finned molly, Poecilia sphenops, which can live in fresh water, brackish water, or salt water. The green crab ( Carcinus maenas ) is an example of a euryhaline invertebrate that can live in salt and brackish water.

  8. List of freshwater aquarium fish species - Wikipedia

    en.wikipedia.org/wiki/List_of_freshwater...

    Water Hardness Bristlenose pleco, bushynose pleco: Ancistrus spp. The bristlenose genus has at least 59 identified species and many others yet to be named. [16] Males and female both have long "bristles" on their nose, the males having distinctly longer ones. 72-84 F (20-27 C) Adonis pleco, polka dot lyre-tail pleco: Acanthicus adonis: 100 cm ...

  9. Physical property - Wikipedia

    en.wikipedia.org/wiki/Physical_property

    Some physical properties are qualitative, such as shininess, brittleness, etc.; some general qualitative properties admit more specific related quantitative properties, such as in opacity, hardness, ductility, viscosity, etc. Physical properties are often characterized as intensive and extensive properties. An intensive property does not depend ...