Answer:
1) The Treaty of Versailles caused World War 2 because they ended World War 1.
2) The Cold War lead to new technology because of spy devices.
Explanation:
1) The Treaty of Versailles was really harsh against Germany and forced Germany to accept the "responsibility of the war."
2) During the Cold War technology was made, such as small cameras and video footage. That technology then evolved into things in our modern day world like gopros, cameras, and other wearable devices.
The earliest introduction of zebra mussels in united states probably occurs in 1986.
At that time, commercial vessels from Europe went to north America as a place for freshwater ballast stowaway. They merchants then introduced zebra mussels to the market and it gained popularity ever since. They also introduced zebra mussels population in local lakes and let them reproduce there.
C I think (sry I don’t know but that’s what I think it is ;)