D settle in one place, they could then properly sustain themselves :)
Answer:
The answer is C.
Explanation:
Alfred Thayer Mahan (1840-1914) conceived the idea that sea power was the key to a strong foreign policy. His thinking is behind the building and strengthening of the US Navy, dominating American naval planning. He was so influential that his ideas led to a race among powers to have powerful navies in the 19th and the 20th centuries.
Some countries, require that you, as a foreigner, when you travel, hire a health insurance. If not, they will not grant your visa.
Of course, you can travel without health insurance and nothing can happen. But the purpose of paying a health insurance for the time that you are in a foreign country is that it covers the costs of sudden and unexpected illness or injurt.
In the majority of the cases, health insurance covers out-patient care, in patient treatment, emergency dental treatment and repatriation
A desert is an area that receives very little precipitation - c.
Deserts are mostly areas with sand, as is popularly considered, but it's not only sand that is problematic, it is also the fact that these areas receive very little precipitation (rain) which poses more of a problem.
