Which one of the following categories of animals, is correctly described with no single exception in it ?
A. All reptiles posses scales, have a three chambered heart and are cold blooded (poikilothermal)
B. All bony fishes have four pairs of gills and an operaculum on each side
C. All sponges are marine and have collared cells
D. All mammals are vivparous and posses diaphragm for breathing
