The first known bird fossils date to which era of time

The first known bird fossil date to the mesozoic era of time.

Explanation:

The first known bird fossil is Archaeopteryx. Archaeopteryx were not exactly like modern birds and are called dinosaur like birds ... Carbon dating suggest that these birds evolved during the jurassic period of mesozoic era. These are considered as the only birds of that era. Ancestors of modern birds began to evolve during cretaceous period and kept on evolving through Cenozoic era.

Jurassic

Explanation:

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