Strenuous would fit in the blank
Diphtheria<span>, Haemophilus </span>influenzae<span> serotype b infection,</span>hepatitis B<span>, </span>measles<span>, </span>meningitis<span>, </span>mumps<span>, </span>pertussis,poliomyelitis<span>, </span>rubella<span>, </span>tetanus<span>, </span>tuberculosis<span>, and </span>yellow fever are considered to available
A. it is a survival reaction that helps us live when in dangerous situations
the fight or flight instinct is triggered when scared/in danger. you choose whether to fight, or run away.
you don’t think through options all the time with either running or fighting it. therefore, it’s A.
