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The cat, platypus and man are all mammals, yet one of the most unique features of mammals helps to divide them into two groups. What is that feature? Mention two other characteristic features that are common to all the three animals. 

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(a) Both cat, platypus are oviparous. Oviparous animals are animals that reproduce by laying eggs while man is viviparous. Viviparous animals bear live young that have developed inside the mother's body. 

(b) Characteristics of mammaliai) They are warm blooded animals ii) Mammary glands for the production of milk for their off springs

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