You and your Canadian pen pal enjoy talking about nature together. While your friend describes some birds that she saw today, you realize that one of the birds she described sounds like one you have seen in your home state of Indiana. You remember that all organisms have common and scientific names.

Which would be most appropriate to use to confirm with your friend?

It would be most appropriate to use the scientific names of the bird species to confirm with your friend. Common names can vary by region and may be different for the same species of bird. Scientific names, on the other hand, are standardized and unique to each species, making them a more reliable way to confirm that you and your friend are talking about the same bird.