Over-Analyzing the Biology of Inklings

Since Splatoon's genesis, the discussion around how the inklings' bodies work has made its way throughout the community. As someone deeply fascinated by biology, I thought it would be nice to potentially answer the question: what is the anatomy of the inklings?
Yes, I know I made a typo in the disclaimer.
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Links

Community Discord:   / discord  
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Timestamps

0:00 - Intro
1:10 - Basics
2:30 - Squids Can't Swim?
6:05 - The Sharks and the Cats
8:40 - Plastic Ink
12:35 - Conclusion
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Sources:

https://docs.google.com/document/d/1E...