The British blockade prevented food and raw materials from reaching the Central Powers. Germany’s ships from entering their own ports. Germany from collaborating with the Central Powers countries. ships from leaving German ports to fight the Allies.

You can drink laxative, or  do this exercise when you are sitting in the bathroom on the toilet. to relieve  constipation  fast or in about 1 minute, pinch your nose after your usual exhalation. start holding your breath. but do not mouth breath during this just hold your breath.