Can you explain the family tree of dinosaurs given in ncert

Dear student,
The family tree of dinosaur shows the evolutionary relationship between the reptiles and the birds. Dinosaur evolved from reptiles and resulted into the evolution of birds. Tyrannosaurus and Triceratops are the ancient dinosaur which evolved during late cretaceous period. These dinosaur evolved from modern day reptiles and further evolution forms archaeopteryx (connecting link between reptiles and mammals) which results into the evolution of birds.

Regards

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The study shows that the familiar anatomical features of birds – such as feathers, wings and wishbones – all first evolved piecemeal in their dinosaur ancestors over tens of millions of years. However, once a fully functioning bird body shape was complete, an evolutionary explosion began, causing a rapid increase in the rate at which birds evolved. This led eventually to the thousands of avian species that we know today.
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