King Egbert VI is falling ill. His calcium concentration is dropping to dangerously low levels. Parathyroid hormone (PTH) is released and blood calcium levels begin to rise. Shortly after, PTH release slows. Is this an example of a positive or negative feedback mechanism and what is the initial stimulus?     a)  Positive feedback; reduced PTH   b)  Negative feedback; increase PTH release   c)  Positive feedback; decline in calcium release   d)  Negative feedback; low calcium   e)  Negative feedback; reduced PTH

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