Which of the following characteristics will most likely be helpful in identifying a butterfly using a dichotomous key?Migrates north every spring. Hangs on branches to rest. Flutters wings faster on hot days. Hind wings have tail extensions.

Hind wings have tail extensions.

Explanation:

The dichotomous key is a tool which is used by the scientists to identify the unknown living organisms by comparing the observable characteristics of unknown with known living organisms. It stresses to identify the organisms or species by their scientific names and every species has a particular scientific name. Hind wings of butterfly is the observable characteristic which can be compared with that of other known butterfly species that also have a tail extension. This physical characteristic will help in identification of butterfly.