The answer to this question can be quite subjective. Some people will say that the telephone is the most important invention, or the automobile, or the plane, but for me personally, I'd choose antibiotics.
It is a modern-day invention (as opposed to the Middle Ages, for example) which changed our lives for the better. Before penicillin was discovered in the 1920s by Alexander Fleming, people were constantly dying because of most harmless diseases. But after antibiotics were invented, people were given a chance to recover from their illnesses much more easily.
Answer:
Indus, Vedic ,Maurya, Gupta
Answer: The answer is D.
Explanation: When the Europeans came to America, they brought diseases with them that killed millions of Native Americans. In addition, the Europeans and the Native Americans had many conflicts because the Europeans were taking over the lands of Native Americans.
Hopefully this helps!
The correct answer is that groups of people may be classified in a reasonable way.
This is only for things like statistical data when doing the decennial census or anything similar.
