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shorter Snowball Earth periodWired
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A new study suggests that Snowball Earth may have been a trigger for the evolution of complex life.
The research offers a novel take on the emergence of multicellular life, a paleontologist says.
The last ancestor of animals emerged during the Sturtian Snowball era, sometime 717 million years ago .
As seawater gets colder, the density and viscosity of water molecules rises as the temperature drops.
Under the conditions of Snowball Earth , the ocean would have been twice or even four times as viscous as it was before the planet froze over.
Paleobiologist Carl Simpson has led a body of work to study whether the physics of cold water causes cells to act collectively like a multicellular creature.
Algal cells clumped up and coordinated the movements of their tail-like flagella to swim more quickly.
By working together as a collective, the algae could preserve their mobility.
Viscosity may have mattered quite a lot in the origins of complex life, whenever that was.
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