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.
Playing with the lives of unfortunate villagers is a well-known network of quacks who give a damn for the medical fundamentals. Due to lack of proper training, some of the quacks liberally administer steroids, sex stimulating drugs and spurious medicines which badly upset the balance of hormones in human body.