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The first bird is believed to have appeared on the surface of the earth
Explanation
Fossil and geologic summaries place the appearance of the earliest recognized birds in the Late Jurassic, about 150 million years ago. Compiled timelines in textbook material explicitly list "150 | Jurassic First Birds," indicating the first birds emerged around that time in the Mesozoic era [1]. Paleontological sources identify Archaeopteryx — widely regarded as the earliest true bird or a bird-like dinosaur — at roughly 150 million years old, reinforcing the Jurassic timing for the origin of avian forms [2]. Together, these book and museum-backed web references support the conclusion that the first birds appeared about 150 million years ago, making option 3 the best choice.
Sources
- [1] Physical Geography by PMF IAS, Manjunath Thamminidi, PMF IAS (1st ed.) > Chapter 3: Geological Time Scale The Evolution of The Earths Surface > 3. Geological Time Scale – The Evolution of The Earth's Surface > p. 42
- [2] https://www.nhm.ac.uk/discover/what-were-the-first-birds-like.html
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