Question

How did the discovery of an effective vaccine by Louis Pasteur lead to the growth
of Europe's population?

The use of vaccines caused women to become more fertile and produce more children.

Vaccines enriched the quality of food being produced, which caused people to live longer and reproduce longer.

The use of vaccines helped Europeans live long enough to produce more children and helped children reach adulthood.

Vaccines reduced the number of diseases in the world, so fewer people suffered illness.

Answer 1

The correct answer is:
- The use of vaccines helped Europeans live long enough to produce more children and helped children reach adulthood.

Explanation: Pasteur’s vaccines reduced deaths from infectious diseases, especially child mortality. With fewer children dying and more adults surviving to reproductive age, population size increased.