Which one of the following categories of animals, is correctly described with no single exception in it?
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All reptiles possess scales, have a three chambered heart and are cold blooded (poikilothermal)
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All bony fishes have four pairs of gills and an operculum on each side
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All sponges are marine and have collared cells
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All mammals are viviparous and possess diaphragm for breathing
B.
All bony fishes have four pairs of gills and an operculum on each side
Prototherian mammals are oviparous. Sponges are aquatic mostly marine some freshwater have cellular grade of organization. Choanocytes or collar cells are characteristics of porifers. Four pair of gills occur in bony fishes. The gills are covered over by operculum on either side.
All reptiles posses scales, are cold blood but have three-chambered and four-chambered heart.
