their diets their DNA their body sizes their geographic distribution
I gave my students this multiple choice question: Some scientists have suggested that pandas may be more closely related to raccoons than to bears. What could scientists compare between pandas and the raccoons to help classify the panda more accurately?

Only one answer is correct among these 4 choices:
- their diets
- their DNA
- their body sizes
- their geographic distribution

Could you tell me which one is correct?

their DNA