Question

Which one of the following categories of animals is correctly described with no single exception in it?

• 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).

Answer 1

Answer: (A)

Platypus is an anoviparous 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.