Question

why birds is said to have originated from reptiles

Answer 1

Answer:

Birds have frequently been called "glorified reptiles". In spite of the fact that the feathered creatures are assembled as a different vertebrate class "Aves", aside from the energy of flight and elements which are associated with it, they are fundamentally like reptiles.

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Answer 2

Answer:

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So a reptile is an animal that is ectothermic and has scales, and birds would not be reptiles. In the 1940's, a biologist named Willi Hennig came up with another classification system that he called phylogenetics. ... The first groups of reptile-like animals evolved about 320 million years ago

Birds have frequently been called "glorified reptiles". In spite of the fact that the feathered creatures are assembled as a different vertebrate class "Aves", aside from the energy of flight and elements which are associated with it, they are fundamentally like reptiles