How These Animals Lost Their Heads (And Bodies, and Butts)

The video explores the concept of evolutionary loss, highlighting how certain animals like bivalves, tardigrades, and sea stars have lost significant anatomical features over time. Bivalves have evolved to lose their heads, saving energy by becoming filter feeders. Tardigrades have undergone body reduction, losing major gene groups but thriving in diverse environments. Sea stars have transitioned from bilateral to radial symmetry, losing their trunk but maintaining functionality. The video concludes that complex anatomy isn't always advantageous, and evolutionary loss can be beneficial.

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