there are no bones in any kind of squid
your jaw
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 invertebrates; they have no spine.
Ossification is bone formation. Calcification is the hardening of tissue into a bonelike structure. Not much, Thay are the same process with different names.
Ossification is bone formation. Calcification is the hardening of tissue into a bonelike structure. Not much, Thay are the same process with different names.
Its beak helps the squid bite its food.
don't seeds
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The cuttle fish 'thing' is a rigid bonelike structure we call a cuttle bone commonly used in birdcages for birds to clean/hone their beaks.
A squid's tentacles are homologous to the snail's foot.
Squids are invertebrates, therefore they do not have spines. An earlier form of the squid had a shell, but this is obviously no longer present. However, a structure called the pen remains, part of the old shell. This is what helps the squid to maintain its structure.
Squid are invertebtrates. Vertebrates have a backbone. Squid are invertebrates because they have no backbone or skeletal structure.