1. George Stephenson was a British inventor and engineer who designed many of the first railroad tracks. How did Stephenson's work contribute to the success of the railroad system? a. He worked with locomotive designers to ensure the the trains would run

smoothly on his tracks.

b. He build his tracks using a type of steel that would last a long time because of

the proportion of iron in the rails.

c. He insisted that all of the tracks he designed conformed to a standard size,

which made it easier to connect all the tracks later.

d. He designed a type of track that could be curved around obstacles more easily.

2. How did the discovery of an effective vaccine by Louis Pasteur lead to the growth of the Europe's population?
a. The use of vaccines helped Europeans live long enough to produce
more children and helped children reach adulthood.
b. The use of vaccines caused women to become more fertile and
produce more children.
c. Vaccines enriched the quality of food being produced, which
caused people to live longer and reproduce longer.
d. Vaccines reduced the number of diseases in the world, so fewer
people suffered illness.

3. How did the rapid growth of the population during the Industrial Revolution affect life in England's cities?
a. As factories grew, they helped pay for services usually provided by
cities.
b. Cities were abled to update their services quickly and at little
expense.
c. Cities were unable to keep up with the demand for services.
d. Population growth had little effect on life in England's cities