Which best defines "endemic"?

The term "endemic" specifically refers to a species or condition that is native to a particular geographic area and is not naturally found elsewhere. It emphasizes the unique relationship between the species and its specific environment, indicating that it has evolved or adapted particularly in that locality. This is commonly used in biology to describe plants or animals that are unique to a certain region.

In contrast, widespread across various regions suggests a distribution that is not limited to one area, which does not align with the definition of "endemic." Beneficial in many settings implies versatility and adaptability, which again contrasts with the notion of being specifically tied to one location. Adopted by different cultures involves the idea of cultural exchange, which is unrelated to biological or geographic specificity. Thus, the definition that closely captures the essence of "endemic" is that it is native to a specific area.