What is the purpose of the Barrier Islands? to provide a food source for local residents
to harvest energy sources from the ocean
to protect the coast by blocking wind, water and sand
to create a haven for immigrants

How do the narrow ribbons of sand that line the Atlantic and Gulf coasts ... Barrier islands protect about 10 percent of coastlines worldwide.Such as reducing coastal erosion, purifying water and providing habitat for fish and birds. New islands can form out in the ocean, either because local sea level.

To protect the coast by blocking wind, water and sand

Explanation:

levels of production can be increased by technology while holding labor and capital constant, because increased technology makes the production process more efficient. subsequently, the lras curve is almost a vertical line, that can shift to the right, with an increase in technology.

the relationship between the lras curve and the ppc is that both can make the economy could grow. the ppc achieves that when it shifts outward because of more resources or technological advances while the lras curve shifts if more resources are developed or if there are technological advances.

the lras curve is a vertical line at an output level that represents the number of goods and services a nation can produce over a sustained period using all of its productive resources as efficiently as possible with all of the current technology available to it.

the production possibilities frontier (ppf) is a graphical device that is used for economic analysis of production decisions because the ppf measures the maximum possible combinations of two goods that an economy is capable of producing with its currently available resources and technology.