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According to scientists, aves have evolved from:

Reptiles

Aves have evolved from reptiles. Archaeopteryx lithographica is a connecting link between reptiles and aves. The fossil bird was of the size of crow and had both reptilian and avian characters.

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42

A gradual change, over a long period, in a form of life is known as :

 43

Scientists believe that all life originated in:

 45

The theory of evolution of species by natural selection was given by:

 46

The term 'father of genetics' is used for the scientist: