A) In chondrichthyes, notochord is persistent throughout life.
B) All mammals are viviparous and possess diaphragm for breathing.
C) All sponges are marine.
D) All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal).
Correct Answer: A
Solution :
[a] Platypus is an oviparous mammal. Spongilla and Euspongia are fresh water sponges. Crocodiles have four chambered heart. In the members of class chondrichthyes, the notochord is persistent throughout life.
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