What was a new weapon introduced in world war 1

There were many new weapons introduced in WWI but a few major ones were; machine guns, artillery, barbed wire, poison gas (mustard gas was the worst at the time), U Boats (submarines), tanks, and improved rifles. The answer your assignment is probably looking for though is the machine gun. :)

RIFLES. The standard rifle of the British army during World War I was the Lee-Enfield .303, a variation of a weapon that had been used by the army since 1902

BARBED WIRE

 MACHINE GUNS

 ARTILLERY

 POISON GAS

AIRCRAFT

TANKS


AIRSHIPS

To be honest i thinks its between the first answer and the third answer