In Arizona, nature is diverse and dramatic. The state's Tonto Natural Bridge State Park is home to the world's largest natural travertine bridge, where visitors can hike and explore its unparalleled ...

The animals in a biome depend on plants for food. The plants in a biome can also depend on the animals to spread pollen and seeds so new plants can grow. So both plants and animals rely on each other ...

ORACLE, Ariz. — Plopped in the Sonoran Desert, just outside Tucson, Ariz., sits a massive, multilevel greenhouse that's probably best known as the inspiration for a Pauly Shore movie. A slick, stepped ...

Halting and reversing the global decline in biodiversity is now urgent to avoid destabilizing Earth's vital systems that support human well-being. That's the stark message of a new paper published ...