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  • Urochordata - Encyclopedia. com
    Urochordata (sea squirts, tunicates; phylum Chordata) A subphylum that has a reliable fossil record from the Permian, and possible remains in Silurian sediments Urochordates have tadpole-like larvae with notochords in their tails and a dorsal, tubular nerve cord, features that link them with the Chordata The adults have a gelatinous or leathery protective test (the tunic) made from a
  • Chordates - Encyclopedia. com
    Chordates Chordates are a diverse group of animals that comprise the phylum Chordata The phylum is divided into three subphyla based on general physical characteristics: Urochordata, Cephalochordata, and Vertebrata Urochordates have a notochord (a hollow dorsal nerve cord) while in the larvae stage but lose it later in their adult stage Source for information on Chordates: The Gale
  • Chordata | Encyclopedia. com
    Chordata Chordata is a large and diverse group of animals, with roughly 50,000 living species included The majority of chordates belong to a group called Vertebrata Vertebrates have backbones that are composed of vertebrae Some examples of vertebrates are sharks, fish, dinosaurs, and human beings A second group of chordates, called Urochordata, consists of animals found mostly in oceans
  • Sea Squirts | Encyclopedia. com
    Ascidiacea (sea squirts; subphylum Urochordata) A class of sea squirts, most of which inhabit shallow waters where they attach themselves to such structures as rocks, pilings, the bottoms of ships, and coral reefs Deep-water species inhabit soft substrates and are known to occur at depths exceeding 2000 m Most ascidians are inconspicuous and are often covered by smaller sessile animals
  • Thaliacea | Encyclopedia. com
    Thaliacea (salps; phylum Chordata, subphylum Urochordata) A class of tunicates in which two siphons occur at opposite ends of the body, so the current of water passing through the animal is used for gas exchan Source for information on Thaliacea: A Dictionary of Zoology dictionary
  • Cephalochordata | Encyclopedia. com
    Cephalochordata (Acrania) Subphylum of Chordata, containing only Amphioxus (lancelet), probably the most primitive of living chordates, although some soft-bodied Cambrian fossils are dubiously referred to the group Cephalochordates have a notochord extending into the head, gill slits, and segmented muscle blocks, and are thought to resemble the ancestors of vertebrates
  • Holy Roman Empire - Encyclopedia. com
    HOLY ROMAN EMPIRE HOLY ROMAN EMPIRE The Holy Roman Empire was a feudal monarchy that encompassed present-day Germany, the Netherlands, Belgium, Luxembourg, Switzerland, Austria, the Czech and Slovak Republics, as well as parts of eastern France, northern Italy, Slovenia, and western Poland at the start of the early modern centuries It was created by the coronation of the Frankish king
  • Castro, Fidel - Encyclopedia. com
    Castro, Fidel 1926- ENTERING POLITICS ARMED REVOLUTIONARY REVOLUTIONARY IN POWER RADICALIZATION OF THE REVOLUTION NUCLEAR GAMBLE AND RELATIONS WITH SOVIETS SPECIAL PERIOD REVOLUTIONARY LEADER BIBLIOGRAPHY Fidel Castro, a first-generation Cuban, was born August 13, 1926, to a wealthy farming family in the eastern region of Oriente Their 11,000 hectares produced wood, sugarcane, and cattle His
  • The Lake Isle of Innisfree - Encyclopedia. com
    The Lake Isle of Innisfree William Butler Yeats 1893 Author Biography Poem Text Poem Summary Themes Style Historical Context Critical Overview Criticism Sources Further Reading First published in the collection The Rose in 1893, “The Lake Isle of Innisfree” is an example of Yeats’s earlier lyric poems Throughout the three short quatrains the poem explores the speaker’s longing for the
  • James Watt | Encyclopedia. com
    James Watt Born: January 19, 1736 Greenock, Scotland Died: August 25, 1819 Heathfield, England Scottish engineer, instrument maker, and inventor The British instrument maker and engineer James Watt developed an efficient steam engine that was a universal (covering everything) source of power and thereby provided one of the most essential technological parts of the early industrial revolution





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