gradual climate change continued climate stability sudden global climate change gradual ecosystem succession
I gave my students this multiple choice question: A large number of species on Earth became extinct during a short time period about 65 million years ago. Based on this pattern of extinction, which is the most likely cause?

Only one answer is correct among these 4 choices:
- gradual climate change
- continued climate stability
- sudden global climate change
- gradual ecosystem succession

Could you tell me which one is correct?

sudden global climate change