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A UA team shows that evolution is driven by dependency on other species within ecological communities – testing a long-held idea of the late UA professor George Gaylord Simpson.

On Earth Day, many pause to think about the state of our natural world, from climate change to plastic pollution and endangered species. But students researching in the Department of Soil, Water and Environmental Science think daily about how to tackle environmental challenges, including water quality issues, greenhouse gas emissions and mining reclamation.

Vertical farming offers opportunities to grow more crops on a smaller footprint, especially in urban areas. It also presents unique educational opportunities.

Earlier this year, the Environmental Protection Agency and the Army Corps of Engineers said ephemeral streams would not fall under federal jurisdiction under the Clean Water Act. It was a change from rules finalized by those same agencies in 2015, under the Obama administration. "The hook is, 'Waters of the United States.' Those are the jurisdictional waters," said Bethany Sullivan, an assistant professor at the UA James E. Rogers College of Law. "Well, what does that mean? That definition has evolved tremendously over time."