Economic growth is defined as a nation’s ability to continually expand its own ppc (or ppf). list two things that a nation expand its economy (hint: focus on the factors of production).

The two things that help the nation to expand its economy focusing on factor of production are allocation of resources and decision on composition of Goods and services.

Explanation:

In the company's analysis, PPF is a graph showing the different possible quantities that can be produced by two separate goods when the availability of a specific good needed to manufacture the determined products. PPF for optimal production efficiency is also known as "production curve" or "transformation curve".  

PPF is the point where the country's economy produces its goods and services in the most efficient way, and thus allocates resources in best possible way. So the economy needs to decide what composition of goods and services can and should be produced. It is to maximize the overall benefit of the company by using the available resources and technology. These things can help a nation to expand its economy in an efficient way.

the correct answer is in fact b. spring tides are the highest, while neap tides are the lowest.