In europe , three lineages of bears evolved in a common ancestor. two of those lineages led to present-day black bears and brown bears. the third lineages led to cave bears that went extinct 24,000 years ago. which of the following could explain why only one group of bears were extinct?

I think you forgot to give the options along with the question. i am answering the question based on my knowledge and research. "One group of bears was less highly evolved less than the two other groups and was destined to die out" is the one that explains why only one group of bears were extinct. I hope the answer has helped you.

The answer is observations and interpreting.