Answer:
The correct answer is option C. an oasis.
Explanation:
An oasis is a geographical area or unexpected natural water source that is present in the desert. These water resources provides the very much needed relief by providing water to the organisms, animals and help in growing vegetation in the desert and dry area.
It can provide water and relief from sun and heat by providing shade and needed water as it offers not just water but a shelter to the animals, if it is a large enough for human settlements and crop nearby it.
Thus, the correct answer is option C. an oasis.

Mortality rate, or death rate, is a measure of the number of deaths in a particular population, scaled to the size of that population, per unit of time.
That would be natural cures
Sushi: It's not deep-fried or smothered in sauce, and most types of sushi have no added fat. It can also be a good source of omega-3 fatty acids from the fish.
Tuna: Tuna, for its part, is a source of high-quality protein with almost no fat. It contains all essential amino acids required by the body for growth and maintenance of lean muscle tissue.
Salmon Fish: Salmon is rich in long-chain omega-3 fatty acids, which have been shown to reduce inflammation, lower blood pressure and decrease risk factors for disease.
Eggs: Eggs are a low-calorie food rich in protein and other nutrients. Eating eggs may support weight loss, especially if a person incorporates them into a calorie-controlled diet. Research suggests that eggs boost metabolic activity and increase feelings of fullness.
Red Kidney Beans: Being rich in protein, fiber, and so-called slow-release carbs, kidney beans are particularly effective at maintaining healthy levels of blood sugar when included with meals. Kidney beans are an excellent dietary choice for diabetics and those who want to stabilize their blood sugar levels.