Assertion: captivity's environment | /r/CapableOf | keep a whale's fin
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text: You'll have to wait for my book to read more about what it is about the mechanical environment that keeps a whale's fin up (or not), but the gist of it goes something like this: the forces created by the way (quantities and qualities) you move through the environment most natural to your body (read: your DNA) create structural responses that your body depends on.