WebAll chordates are vertebrates. Which of the following statements is NOT true? - All chordates are vertebrates. - Chordates are found in all major types of environments. - All chordates have a notochord. - All chordates have a dorsal nerve cord. - All chordates have pharyngeal pouches or gill slits. Skeletal system WebWhat kind of digestive system do chondrichthyes have? General Characteristics of Chondrichthyes Their digestive systems have spiral valves and, with the exception of …
Chondrichthyan Definition, Species, & Facts Britannica
WebMay 14, 2024 · Cartilaginous Fishes (Chondrichthyes) The cartilaginous fishes such as sharks, skates, and rays have developed high levels of urea in their blood. Shark's blood … WebMay 11, 2024 · Chondrichthyes A class of vertebrates comprising the fishes with cartilaginous skeletons. The majority belong to the subclass Elasmobranchii (skates, … firewall pchome
Chondrichthyes - Taxonomy, Characteristics, Growth and …
WebApr 9, 2024 · Physical Appearance of Chondrichthyes Elasmobranchs are the sub-class under Chondrichthyes. Vertebrates of elasmobranch fishes are different from bony fishes in many aspects. The skeletons of the cartilage fishes are calcified because they lack true bones except in the root of teeth. WebHumans are not chordates because humans do not have a tail. Vertebrates do not have a notochord at any point in their development; instead, they have a vertebral column. Show Answer The dorsal hollow nerve cord derives from ectoderm that rolls into a hollow tube during development. In chordates, it is located dorsal to the notochord. WebThe vertebrate heart lies below the alimentary canal in the front and centre of the chest, housed in its own section of the body cavity. During the development of an embryo, the heart first appears below the pharynx, and although it may also be in this position in adult animals, the heart often moves posteriorly as the animal grows and matures. etsy custom candy