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While researching a topic, a student has taken the following notes:
- The El Pinito Mountains are a mountain range located in northwestern Mexico.
- The range is one of the dozens of "sky islands" in the southwestern US and northwestern Mexico.
- A sky island is an isolated mountain range whose environment differs drastically from that of the surrounding lowlands.
- The US Forest Service (USFS) said, "The mountains are 'islands' surrounded by deserts that are 'seas.'"
- The USFS said, "Each Sky Island is a unique ecosystem."