What Is Still Lacking in the Hypothesis of an Asteroid

question 28

Multiple Choice

What is still lacking in the hypothesis of an asteroid impact as the cause of the end-Cretaceous mass extinction?

• A) evidence that an asteroid hit Earth at the time of the extinctions 65 million years ago)
• B) a convincing explanation of why mammals radiated after the event
• C) evidence of the location where an asteroid hit Earth
• D) a convincing explanation of why some lineages survived while others vanished

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