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Our transcription: The mass extinction at the end of the Mesozoic not only exterminated the dinosaurs, it ushered in the present era of geologic time, the Cenozoic. Cenozoic time is marked by intense tectonic changes, which helped to direct events in evolution. For example, when Australia became tectonically detached from other continents, mammals riding aboard this drifting land mass proceeded on their own evolutionary path, resulting in the unusual forms we see in Australia today, such as the duck billed platypus, the spiny anteater, and the kangaroo.
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