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“Volvox,” I read, “it’s Volvox. Is that how you say it?”

Multicellular Volvox can do both at once, because its cells have specialized.

The smaller cells always have flagella, which sweep nutrients over the Volvox's surface and help it swim.

Volvox has repurposed other features of the single cell ancestor as well.

Studies of Volvox, an alga that forms beautiful, flagellated green balls, shows that multicellular organisms also found new ways to use existing functions.