Assertion: octopus's structure | /r/CapableOf | lack gas-filled chambers
Facets:
Source sentences:
text: This structure lacks the gas-filled chambers present in chambered nautilus shells and is not a true cephalopod shell, but rather an evolutionary innovation unique to the genus Argonauta.
text: This structure lacks the gas-filled chambers present in chambered nautilus shells (an extremely primitive relict cephalopod) and is not a true cephalopod shell, but an evolutionary innovation unique to these octopuses.