Squids don't have pens. They squirt ink from a bodily orifice in order to deter predators.
actually, inside the mantle is the pen of the squid, a hard protrusion which is all that remains of the squid's shelled ancestors. (i got this from chacha to do my bio hw)
The pen of a squid is made out of pure calcium nitrate
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.
A backbone.
A squid's tentacles are homologous to the snail's foot.
the pen
The pen
to squirt out ink O_O
a squid with a leaking pen
to help the squid stay up straight
A squid's pen is a stiff, flexible structure made of chitin that runs along its body to provide support and help maintain its shape. It also acts as a site for muscle attachment, aiding in movement and locomotion. Additionally, the pen provides protection for the squid's internal organs.
No. Squid have a vestigial, or highly reduced, internal feather-shaped shell called a "pen".