Ancestors of the Octopus Were Once Protected by Hard Shells - ZergNet

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Ancestors of the Octopus Were Once Protected by Hard Shells

Ancestors of the
Octopus Were
Once Protected
by Hard Shells

The ancestors of octopuses and squid once sported hard shells, but when did they lose their "mobile homes" and become agile, soft-bodied swimmers? A new study finds that this change may have...