Getting enough oxygen in the water can be hard work. While fish and many other aquatic animals take air directly from the water through gills, other animals find ingenious ways to drag air bubbles ...
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 ...
Let's Learn is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV, Amazon Fire Tablet, Roku, Samsung Smart TV, and ...
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