Merfolk lung system similar to dolphins

Merfolk are one of the major species in my book. However, unlike in most depictions, they're fully mammalian and lack gills. Because of this, they need to breathe air, but I still wanted them to be able to open their mouths underwater. I know that dolphins' lungs aren't connected to their mouths, which allows them to hunt for prey without filling their lungs with water. Would it be possible for a hominid to develop a system like this if it became fully aquatic?

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Merfolk lung system similar to dolphins

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