Animal Kingdom
Which among these is the correct combination of aquatic mammals?
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Single Choice
Which one of the following categories of animals, is correctly described with no single exception in it?
AAll bony fishes have four pairs of gills and an operculum on each side.
Correct Answer
BAll sponges are marine and have collared cells.
CAll mammals are viviparous and possess diaphragm for breathing.
DAll reptiles possess scales, have a three-chambered heart and are cold blood (poikilothermal).
Solution
All bony fishes have four pairs of gills and an operculum on each side.
Sponges are mostly marine, but there are a few freshwater species as well.
Not all mammals are viviparous. monotremes are oviparous mammals.
The only crocodile is an exception in reptiles which possess a 4-chambered heart.
Thus, the correct answer is option A.
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