Which of the following characteristic features always holds true for the corresponding group of animals?
Correct answer: C. Cartilaginous endoskeleton - Chondrichthyes
- A. Possess a mouth with an upper and a lower jaw - Chordata
- B. 3-chambered heart with one incompletely divided ventricle - Reptilia
- C. Cartilaginous endoskeleton - Chondrichthyes
- D. Viviparous - Mammalia
Explanation
Chondrichthyes, a class of fish that includes sharks, rays, and chimaeras, have a cartilaginous endoskeleton. This means their internal skeletal structure is made of cartilage rather than bone, providing flexibility and reduced weight for life in the water. Phylum Chordata includes both jawless vertebrates (Agnatha) and jawed vertebrates (Gnathostomata). Reptilia have a four chambered heart with two auricles and two ventricles. Duck billed platypus and spiny anteater are oviparous mammals.
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