The figure below shows the number of living taxonomic families that existed on Earth during the last 540 million years. The sudden decreases in family numbers at 445, 360, 250, 200, and 65 million years ago represent Earth's five mass extinction events. Based on this data, which mass extinction had the biggest impact on the overall diversity of life on Earth? 
A) 200 million years ago
B) 250 million years ago
C) 360 million years ago
D) 445 million years ago
Correct Answer:
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