Practice question
Question
Which one of the following is a mammal?
Explanation
Whales are fully aquatic mammals within order Cetacea, warm-blooded, viviparous, lactating with mammary glands, breathing air via lungs and blowhole. In contrast sharks, trout, salmon are fishes, poikilothermic, oviparous, respiring through gills, lacking mammalian characteristics entirely.
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