How do the life of our ancestors differ from the way of life of the 21st century

Well, depends which period we are discussing about, but in general our ancestors didn't have technological improvements as we do today that could enable them to live easier. Also, people lived in different types of buildings, ate different food, their immune system wasn't developed, were dying at young age...

Explanation:

Technological improvements throughout history led us to what we are today.

In prehistory our ancestors lived in caves, in the open, had to fight every day to survive, to have enough resources.

In the Middle Ages average life expectancy was around 25 to 35 years. Today it goes even above 80.

We have mobile phones, computers, airplanes, our ancestors sometimes had to wait to obtain certain information even for months.

the answer is a) high entry costs

during both period congress passed law restricting the civil liberties of american citizen that meet with the overall public support is the one statement that explain the rate scare of the 1920 and 1950 is very similar