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.
Answer:
Certain specimen cannot thrive in areas of high temperature.
Answer: A.
Explaniton:
Although you might not want to speak publicly about your project, if you do good enough you'll be rewarded! We aren't rewarded when actually speaking with people, but its good to know you did well because that'll make you more confident to talk to others just the same way.
I am gonna go with A on this one
