Immune is to be protected or exempt, to not be affected or influenced, in the passage, <em>the word immune refers to the ability to not being affected by dangers, the phrase D. in a variety of habitats and climates helps the reader understand that armadillos can resist in different habitats and climates.</em>
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It helps you understand the main things you want to talk about. It also shows you what is basically the same type of idea or like a synonym of that idea.<span />