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Both amphibians and reptiles are poikilothermic (cold-blooded), meaning their body temperature varies with the environment (NCERT, Chapter 4, page 58). Warm-bloodedness is specific to birds and mammals, mammary glands to mammals, and feathers to birds.
Ref: NCERT Class 11 Biology Chapter 4: Animal Kingdom Vertebrata - Aves and Mammalia
The Phylum Chordata is a major taxonomic grouping characterized by the presence of a notochord and a dorsal hollow neural system at some stage in the organism's life cycle. Because diverse classes such as fishes, amphibians, reptiles, birds, and mammals all exhibit these defining features, they are unified under this single phylum.
Ref: NCERT Class 11 Biology
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