Answer:
Antibiotics
The Internet
Nuclear Power
The automobile
The Airplane
Step-by-step explanation:
The antibiotic is the most important advancement of the 20th century. Prior to the discovery of antibiotics most infections and viruses were potentially fatal. Antibiotics reduced the mortality rate and expanded the life-span.
Nuclear power is the second most important advancement of the 20th century. This discovery created a power source that doesn't pollute, is unlimited, and is very cost efficient.
The Automobile is the third most important advancement of the 20th century. The automobile gave everyone an efficient way of transportation during everyday life. It also increased trade by using the method of trucking in goods.
The internet is the fourth most important advancement of the 20th century. It allows people to communicate with others and get information from all around the world. It also made it possible for people to buy and sell anything.
Lastly, the airplane is the fifth most important advancement of the 20th century. The airplane makes it possible for people and goods to travel all around the globe in a matter of hours. It has also changed warfare, allowing soldiers to fight from the sky.
I placed the advancements I chose in the order of importance. Antibiotics is first because it saves numerous lives everyday. Nuclear energy is second because it provides a clean and efficient power source for everyone. Automobiles are third because they give everyone a quick way to transport themselves. The internet is fourth because it allows everyone access to the knowledge of the whole world. Lastly, airplanes are fifth because they provide a safe and quick way to get around the globe.
Hope this helped!