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Which of the following characteristic features always holds true for the corresponding group of animals?

  1. A
    Viviparous: Mammalia
  2. B
    Possess a mouth with an upper and a lower jaw: Chordata
  3. C
    3 – chambered heart with one incompletely divided ventricle: Reptilia
  4. D
    Cartilaginous endoskeleton: Chondrichthyes

Solution & Step-by-step Explanation

- Chondrichthyes (cartilaginous fish) always have a cartilaginous endoskeleton.Not all mammals are viviparous (e.g., Platypus is oviparous).Not all chordates have jaws (Agnatha lack jaws).Crocodiles (Reptilia) have a 4-chambered heart.

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Which of the following characteristic features always holds true for the corresponding group of animals?
A
Viviparous: Mammalia
B
Possess a mouth with an upper and a lower jaw: Chordata
C
3 – chambered heart with one incompletely divided ventricle: Reptilia
D
Cartilaginous endoskeleton: Chondrichthyes

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