It's intended emotional effect on the reader. Feel free to ask more questions if needed
<span>Show the ambiguity and inherent questions in human beings and their morality. Because the works are so ambiguous, they make the reader question their own morality, as well as the nature of morality in general. He played off the idea of people's base desires and of doing the right thing.</span>
We can actually infer that the details from "The Oasis: Africa" that best supports the central idea that nature can be severe and unkind is: "Clutch tight your water-skin on the desert, for there is no charity on the Sahara, and he that has no water shall not drink!"
<h3>What is central idea?</h3>
Central idea of a passage or story actually refers to the major and important idea that is seen in that passage or story which the writer seeks to communicate to the readers.
Central idea is also known as main idea. It usually tells about the important subject of a text, passage or story.
We can see that the last option actually shows the central idea of how nature can be unkind and severe. It shows that the Sahara (a natural desert area) has no charity for people.
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