Sample, case, instance, illustration.
The answer would be paragraphs two, three, and six. And if you have any more like this just look for the quotation marks
hope this helps if not just let me know
Answer:
People start living on other planets.
Scientists invented artificial food.
We found a solution to the problem of poverty.
Doctors discovered a cure for cancer.
Most people move to very large cities.
We used all the fossil fuel on Earth.
The world became a peaceful place.
People made the environment cleaner.
Based on my interpretation of this website, I believe it's the astronomers. :)
