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en.wikipedia.org/wiki/Notochord

In anatomy, the notochord is a flexible rod made out of a material similar to cartilage. If a species has a notochord, it is, by definition, a chordate. ... In some chordates, it persists throughout life as the main structural support of the body, while ... Isolated notochordal remnants may escape their lineage-specific destination in the ...

glencoe.mheducation.com/sites/0078675642/student_view0/unit8/chapter29/standardized_test_practice.html

Chapter 29: Echinoderms and Invertebrate Chordates. Echinoderms ... 3, An animal that retains its chordate features throughout life is the _____. Need a Hint ?

www.flashcardmachine.com/animal-kingdom-testreview.html

Apr 19, 2012 ... Because sponges are sessile, they get their food through ______. ... An animal that retains its chordate features throughout life is the _____.

www.boundless.com/biology/textbooks/boundless-biology-textbook/vertebrates-29/chordates-171/chordates-and-the-evolution-of-vertebrates-664-11885

Chordata contains two subphylums of invertebrates: Urochordata (tunicates) and ... structures that classify chordates, but adult tunicates retain only pharyngeal slits. ... four distinctive features of chordates at some point during their development: a ... Animal Life, Characteristics of Vertebrates, and Characteristics of Chordata.

www.shsu.edu/~bio_mlt/Chap2.html

... derived characteristics of chordates distinguish them from their ancestors: ... these characteristics need not be retained throughout life for an animal to be ...

www.mhhe.com/biosci/pae/zoology/hickman11/student/olc/chapter25-synopsis.mhtml

... 36: Chemical Coordination, Chapter 37: Immunity, Chapter 38: Animal Behavior ... For simplicity, however, this text retains the traditional Linnaean classification, but ... These characteristics are found in all chordates at some stage of their life ... In the protochordates and jawless vertebrates, it is persistent throughout life.

www.britannica.com/animal/tunicate

Jul 12, 2011 ... A characteristic tadpole larva develops in the life cycle, and in one group ... Most chordate features disappear at metamorphosis. ... Their structure suggests that they are ascidians modified in adaptation to conditions in open water. ... Free- swimming tunicates are found throughout the oceans as plankton, ...

www.encyclopedia.com/plants-and-animals/animals/vertebrate-zoology/chordata

The three features unique to chordates and found in all of them at least during early ... into the head and keeps the animal from telescoping when its muscles contract. .... Throughout life, hagfish and lamprey retain the notochord, a supporting ...

www.britannica.com/animal/chordate

Mar 30, 2012 ... As the name implies, at some time in the life cycle a chordate possesses a ... Vertebrates retain traces of a feeding apparatus like that of tunicates and cephalochordates. ... In its primitive form, fertilization occurs externally, in the water. .... possess gill slits and other features not found in other animal phyla.

www.dcmp.org/guides/TID5962.pdf

characteristics can only be seen during a relatively small portion of the life ... embryonic or larval stage, when the animal is difficult to observe). ... throughout the life cycle as .... 2) How long ago did phylum Chordata get its start? ... 5) Which class of chordates retains all of the four basic chordate characteristics in the adult .