A Two-Sided Starfish? 500-Million-Year-Old Fossils Reveal How The Starfish Got So Star-ShapedHow Did The Starfish Become A Star? 500-Million-Year-Old Fossil Solves Evolutionary MysteryFrom bilateral to pentaradial, the starfish took a basic body plan and ran.This is Astropecten articulatus, but there was a time its ancestors looked very different.Image credit: Mark Walz from Prestonsburg, KY,...
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