25 Most osteichthyan fishes have skeletons made of bone (or some ossification);

Question

25 Most osteichthyan fishes have skeletons made of bone (or some ossification); however, bone has been lost secondarily lost in some groups such as lungfishes, sturgeons, and paddlefishes. a. TRUE b. FALSE 26 Most biologists agree with Walter Garstang's theory that paedomorphosis of tunicate-like ancestor probably was responsible for evolution of fishes. a TRUE b FALSE 27 (fossil line of bony fishes) were characterized by lobed fins, an autostylic jaw suspension, and dentition consisting of a complex surface of folded enamel termed"These characteristics also were shared by the first amphibians (termed.They represent closest known fish relative to the first tetrapods. a. Coelacanths b. Lungfishes ....dipnomorph tooth c. Osteolepids d. Chondrosteans. latimerian tooth (latimerian amphibians or coelacanthibians) ..(dipnomorph amphibians or fishapods) labyrinth tooth chondrodont t .. (labyrinthodont amphibians) tooth... (chondrodont amphibians) e. Holosteans... holodont tooth . (holodontian amphibians) 28 Choanae (internal nostrils) can be found in tetrapods and a. modern coelacanths and bichirs b. osteolepids and modern lungfishes c. modern gars, sturgeons, and bowfin d. all of the above e. none of the above

Explanation / Answer

25) The answer for this question is true. Because the sturgeons have secondarily lost the vertebrate column made of bonebone in which the notochord has been replaced by the segmented series of stiffer elements by intervertebral discs.

26) The answer for this question is true. Because the most biologists are believing that the tadpole larvae of tunicates was descendant of free swimming chordate ancestor.

27) The answer for this question is b, which indicates Lungfish... dipnomorph tooth....dipnomorph amphibian

28) Choanae can be found in tetrapods, and osteolepids and modern lung fishes. Hence the answer for this question is b.

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