B. Red blood cells contain a protein that binds with oxygen.
Explanation:
this would involve the fight or flight syndrome of the peripheral nervous system. when you are faced with an unexpected situation, example, speaking in front of classmates, these symptoms are normal physiologic response..almost if you were being robbed at gunpoint...
Not sure how this has to do with Health but my answer would be to not buy things online at all. Nowadays it's EXTREMELY easy to get robbed of your money, by people that live across the world. Your bank account can easily be accessed through a phone, computer, gaming system, credit/debit card, check book, etc. I covered things both online and off. Stay safe!
