I want to know the answer to the following question:
What are the three things John Herschel maintains need to be shown to allow for a mechanism be called a true cause?
All the background I'm provided with is that "Darwin presents supporting facts drawn from many disciplines, showing that his theory could explain a myriad of observations from many fields of natural history that were inexplicable under the alternate concept that species had been individually created.". Is that enough to answer the question?
Answer: no