Answer:
The details that support the main point of the article are:
Tuvalu has an area of only 10 square miles.
There is only one hospital in Tuvalu, and it's not large.
The population of Tuvalu is about 10,000.
Step-by-step explanation:
According to the instructions, the article's main point is that Tuvalu is one of the smallest countries in the world. Now we need details that will support this claim. Therefore, anything that can show how small Tuvalu is should be seen as a necessary detail.
Most countries have a large area, several (probably thousands) of big hospitals as well as populations of hundreds of thousands if not millions of people. Tuvalu, however, is the opposite of that. It has an extremely small area, only one small hospital, and a population of only 10,000 people. We can see how these three pieces of information help readers visualize how small the country is.