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B
Reptiles and mammals
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C
Fishes and reptiles
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D
Chordates and non-chordates
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Solution
The correct option is D Reptiles and birds Archaeopteryx is a transitional fossil that is considered to be the connecting link between birds and reptiles. This is attributed to its mixed reptilian and avian features. It was discovered in Germany and is often considered as the first or the oldest bird. The fossils discovered place its existence around 150 million years back, in the Tithonian stage of the Jurrasic era.