Paleobiology includes the study of how long-term physical changes of ancient global geography and climate have affected the evolution of plants and animals, how ecosystems have responded to these changes, and how these responses have affected today's patterns of biodiversity. Paleobiologists are interested not only in how the environment has changed, but how ecosystems themselves have changed, and how evolution has occurred in its ecological context over the last 400 million years.  Paleobiologists at Michigan in EEB include experts in fossil mammals, invertebrates, dinosaurs and plants.