Otter

https://www.youtube.com/watch?v=bT74MAudkYI

Cerebrospinal fluid (CSF) is an ultrafiltrate of plasma contained within the ventricles of the brain and the subarachnoid spaces of the cranium and spine.[1] It performs vital functions, including providing nourishment, waste removal, and protection to the brain

Study that! Cerebrospinal fluid 

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