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Mark the correct statement

Options

  1. AAll mammals have placenta
  2. BAll Chondrichthyes are marine animals with a streamlined body with some exceptions
  3. CLarva of all cyclostomates return to fresh water after metamorphosis
  4. DChelone and Testudo are able to maintain a constant body temperature

Correct answer

B. All Chondrichthyes are marine animals with a streamlined body with some exceptions

Step-by-step solution

Chondrichthyes : They are marine animals with a streamlined body and have cartilaginous endoskeleton. Placental mammal (infraclass Eutheria), any member of the mammalian group characterized by the presence of a placenta, which facilitates exchange of nutrients and wastes between the blood of the mother and that of the fetus. The placentals include all living mammals except marsupials and monotremes Cyclostomes are marine but migrate for spawning to fresh water. After spawning, within a few days, they die. Their lar

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