Each group has a different feeding preference. Each group has a different habitat preference. Each group has different mating habits. Each group is active at a different time of day.
I gave my students this multiple choice question: Members of the same species of bird became geographically separated. Over many years, the two groups evolved to become two different species. Which of these observations is the best evidence that two separate species developed?

Only one answer is correct among these 4 choices:
- Each group has a different feeding preference.
- Each group has a different habitat preference.
- Each group has different mating habits.
- Each group is active at a different time of day.

Could you tell me which one is correct?

Each group has different mating habits.