Answer:
It is called the S-A node, or rather sinus node.
Answer:
Its A.
Explanation:
Correct on gradpoint my dooods!
Answer:
Probably not much.
We exhale carbon dioxide every second.
"Burn less trees." - thank you kaliliew16
Therefore, not much can be done.. We would have to all stop breathing to stop the flow of carbon dioxide, meaning we'd all die off quickly due to lack of oxygen.
hope it helps you!