Fossil embryos reveal early animals. Nanedi Vallis provides evidence that a steady source of water once flowed on Mars. Postcards from the Red Planet . When beavers cut down cottonwood trees, they indirectly help cottonwood leaf beetles grow faster and taste nastier. Martinsen, G.D., E.M. Driebe, and T.G. Whitham.
Plants bite back.
Karban, R., and J.H. Myers. 1989. Induced plant responses to herbivory. Wootton, J.T. 1994. The nature and consequences of indirect effects in ecological communities. Fisheries are propping up yields by harvesting stocks that are increasingly lower down the marine food chain.