<span>An increase in scientific and medical discoveries improved life expectancies.
</span>The best possible explanation for the changes in Europe's population since 1750 is that an increase in scientific and medical discoveries improved life expectancies.In fact, it was around this type that basic hygiene norms were implemented, as well as some mortal diseases were cured or to improve lifbetter treated. Moreover, the discovery of vaccinations helped greatly to improve life expectancies.
D. Trade can keep countries from specializing in producing certain goods.
The innovation that enabled ordinary people to buy cars was <span>Henry Ford's assembly line, which made cars inexpensive because they were able to produce them more efficiently and faster.</span>