<h2><em>ANSWER</em><em>:</em><em><u> </u></em><em><u>TRUE</u></em></h2>
<h2><em>EXPLANATION</em><em>:</em><em> </em><em>NOT</em><em> </em><em>SURE</em><em> </em><em>IF</em><em> </em><em>THIS</em><em> </em><em>IS</em><em> </em><em>CORRECT</em><em>.</em><em> </em><em>PLS</em><em> </em><em>TELL</em><em> </em><em>ME</em><em> </em><em>IF</em><em> </em><em>IM</em><em> </em><em>WRONG</em></h2>
The only oral anticoagulant available was
warfarin
I believe there has to be enough activation energy for a reaction to occur in the first place, if that is what you are referencing
Needles.
Sharing needles or things that you can eject through your skin (ex. drugs)
Infected tattoo needle that wasn't cleaned and disinfected properly