Which one of the following categories of...

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

A

All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal)

B

All bony fishes have four pairs of gills and an operculum on each side

C

All sponges are marine and have collared cells

D

All mammals are viviparous and possess diaphragm for breathing.

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The correct Answer is:

B

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