A backbone.
The squid is an invertebrate.
No. Squid are invertebrates.
The pen of a squid is made out of pure calcium nitrate
invertabrate
Invertebrate.
go ask your mom, shes a a squid
nothing
The pen is a feather-shaped internal structure that supports the squid's mantle and serves as a site for muscle attachment. It is made of a chitin-like substance. It is the remnant of the squid's shell, so it is a vestigial structure.
Squid are invertebtrates. Vertebrates have a backbone. Squid are invertebrates because they have no backbone or skeletal structure.
squids are invertabrates. as for all in the phylum molusca.
No, a squid has no internal skeleton or backbone, so is an invertebrate.
A squid's tentacles are homologous to the snail's foot.