How does the passage develop the central idea "elizabethans believed that health depended on the balance of the four humors"?

This would be the answer to your question:

The passage explains how Elizabethans believed that divine intervention caused imbalanced humors.

Hope this helps. 

How does the passage develop the central idea "Elizabethans believed that health depended on the balance of the four humors"?

The correct answer is:
It explains that Elizabethans believed that divine intervention caused imbalanced humors.

I hope this helps a lot to you. 

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