increased competition for resources falling sea levels and global cooling organisms with beneficial traits increased solar activity
I gave my students this multiple choice question: Which of these conditions would most likely be shown in the fossil record as a reason for mass extinctions?

Only one answer is correct among these 4 choices:
- increased competition for resources
- falling sea levels and global cooling
- organisms with beneficial traits
- increased solar activity

Could you tell me which one is correct?

falling sea levels and global cooling