Section 2 â¢ Invertebrate Chordates 803 Chordates are animal s belonging to the phylum Chordata (kor DAH tuh) that have four distinctive featuresâa dorsal tubular nerve cord, a notochord, pharyngeal pouches, and a postanal tailâat some point during their development.ost chordates are vertebrates. Invertebrate chordates, which belong to two of the subphyla of chordatesâCephalochordata and Urochordata, also have a dorsal tubular nerve cord, a notochord, pharyngeal pouches, a postanal tail, and, possibly, an ancestral thyroid gland. They ha ve no backbone, however.
quack 1. (kwÄk) n. The characteristic sound uttered by a duck. intr.v. quacked, quackÂ·ing, quacks. To utter the characteristic sound of a duck.
Definition of 'barrack'. Word Frequency. barrack (bÃ¦rÉk ) Word forms: plural , 3rd person singular present tense barracks , present participle barracking , past tense , past participle barracked. 1. countable noun. A barracks is a building or group of buildings where soldiers or other members of the armed forces live and work. 'Barracks' is the singular and plural form. ...an army barracks in the north of the city.