A Moment in Creation: Fish Relatives?

https://kfuo-od.streamguys1.com/recast/moments-with-kfuo-radio/20210216110309-MIC_02_16_21.mp3
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What is a Lung fish and what is the truth regarding the claim that they are our closest fish relative?

Find all episodes in the Moments with KFUO Radio shows at kfuo.org/moments.

Monday: A Moment on the Lighter Side
Tuesday: A Moment in Creation
Wednesday: A Moment for the Family
Thursday: A Moment of Faith
Friday: A Moment in Scripture