What is the most significant difference between the current extinction crisis and previous mass extinctions?

Question

Quizplus · Accepted Answer

The current extinction crisis is caused by human activities such as habitat destruction, pollution, and climate change, while previous mass extinctions were largely caused by natural disasters.

Answer: B
 The current extinction crisis is happening at a much faster rate than previous mass extinctions. It is estimated that extinction rates are currently at least 1000 times higher than natural background rates.

Note: None of the answer choices are accurate, so the best answer is a combination of both choices B and C.

What Is the Most Significant Difference Between the Current Extinction