The foot of the squid is it's tentacles, it enables the squid to move very very very very very very very fast. The foot is also the mantle of the squid (the mantle is a thick layer of tissues {muscle} all mollusks use to protect their guts). In this case the squid uses it's mantle to run away from predators (swim away).
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The foot of a squid is known as the funnel or siphon. It is a muscular structure used for jet propulsion by taking in water and expelling it forcefully to propel the squid through the water. The funnel helps squids move quickly and efficiently in their underwater environment.
A baby squid is called a "squid larva" or "squid hatchling."
"Jet propulsion" is what squid use to propel themselves through water by expelling water forcefully through a siphon. This allows them to move quickly and efficiently in their marine environment.
a sperm whale
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 squid's kidney functions to filter waste and excess ions from the blood, regulating the balance of salts and fluids in the body. It also helps in maintaining the internal environment of the squid by excreting nitrogenous waste in the form of ammonia.