How fish gill genes helped create your ears

The outer ears that sit on the sides of your head share an unexpected genetic heritage with the gills of fish. According to ...
The Spokesman-Review

Ask Dr. Universe: Most fish use gills to breathe, but some have lungs or other ways

When you and I take a deep breath, we pull air into our lungs. That’s because humans are mammals. But fish aren’t mammals. They usually don’t breathe air. They usually don’t have lungs. That’s what I ...