What evidence convinced scientists that Archaeopteryx should be classified as a bird rather than a small dinosaur?

Scales

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Toothless, elongated mouth like beak

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A tail similar to that of modern birds

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Fused collar bone, indicating flying ability

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Solution

The correct option is D Fused collar bone, indicating flying ability
D. Fused collar bone, indicating flying ability.
Reason: Archaeopteryx is an example of missing link between reptiles and avian species. It retains many features of reptiles such as teeth, claws and a long tail . It also retains a wishbone, a breastbone, hollow thin-walled bones, air sacs in the backbones, and feathers. These characteristics are found in birds.
So, the correct option is D.

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