About 500 million years ago, not a single creature had a skull. Over time, these bony plates evolved into the structural marvels that vertebrates—animals with spinal cords, aka you, me, and your pug, ...

Carla is a writer from Peñuelas, Puerto Rico, now based in Atlanta. She’s an Emory alum with both a BA and MA in English, but more importantly, she’s a Pisces with lots of opinions about video games.

Introduction: Nonnative species in the world / David Pimentel -- The impacts of alien plants in Australia / Richard H. Groves -- Environmental and economic costs of invertebrate invasions in Australia ...