The answer is one mystery that still remains unsolved is why we yawn.
and another theory is that when you yawn it sends oxygen to the brain causing your body to be able to stay awake, hence when you are tired and need to stay awake you yawn a lot.
B. citizen participating in electing leaders
Answer:
A medicinal concoction or mixture of more than one substance.
Explanation:
Hope this helps! :)
