Rate of breathing is controlled by-----

Options :
  1. amount of freely available oxygen
  2. stress
  3. carbon dioxide
  4. all of the above
Answer and Explanation :-

Answer: Option 4

Explanation:

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One of the gravestones in the cemetery near the earliest church has an anchor on it and an hourglass, and the words In Hope.In Hope. Why did they put that above a dead person? Was it the corpse hoping, or those still alive?
-Margaret Atwood The Handmaid's Tale