on feature.a. Pigmented skinb. Alimentary canal with some modificationc. Viviparityd. Warm blooded natureNCERT Class XIBiology - Exemplar ProblemsChapter 4. Animal Kingdom
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viviparity means give birth to young one and nurish to that young one ex:mammals
warm blooded animal means constant body temp that of surrounding ,ex:mammal and birds and some fishes
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