Why didn't mammals evolve for millions of years?
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This question can be interpreted in two ways. If you are asking, “Why did it take so long from the origin of life to the emergence of mammals?” the answer lies in the gradual process of complex life evolving from simpler forms on our planet. The evolution of mammals received a significant boost after the cataclysmic event that occurred 65 million years ago, which cleared space in the environment previously dominated by dinosaurs. This created opportunities for mammals to thrive and diversify.
On the other hand, if you are suggesting that mammals have not undergone evolutionary changes over millions of years, such an assertion would be nonsensical. The fossil record and scientific evidence overwhelmingly demonstrate the extensive evolutionary history and ongoing development of mammals over vast spans of time.