Portland has a national reputation for being an ice cream and donuts city, sure, but at its heart, isn’t it more of a vegetarian rice bowl and bike-powered smoothie town? In a move that should remind ...

A food chain shows how energy is passed between plants ... and getting enough exercise and sleep. Animal life cycles. videoAnimal life cycles This animated film shows the life cycle of a butterfly ...

and relates these food chains to the larger concepts of the oxygen-carbon dioxide and the nitrogen cycles, and to the unending pattern of life, growth, and decay which is known as the food cycle.