Science has increased our knowledge because of this insistence on the search for natural causes. Theories are powerful tools. Scientists seek to develop theories that are internally consistent and compatible with the evidence are firmly grounded in and based upon evidence have been tested against a diverse range of phenomena possess broad and demonstrable effectiveness in problem-solving explain a wide variety of phenomena. The body of scientific knowledge changes as new observations and discoveries are made. Theories and other explanations change.
New theories emerge and other theories are modified or discarded.
Throughout this process, theories are formulated and tested on the basis of evidence, internal consistency, and their explanatory power. There is abundant and consistent evidence from astronomy, physics, biochemistry, geochronology, geology, biology, anthropology and other sciences that evolution has taken place. As such, evolution is a unifying concept for science. In addition, the Benchmarks for Science Literacy from the American Association for the Advancement of Science 's Project 2061, and the NSTA s Scope, Sequence, and Coordination Project as well as other national calls for science reform, all name evolution as a unifying concept because of its importance across the discipline of science. Scientific disciplines with a historical component such as astronomy, geology, biology, and anthropology, cannot be taught with integrity if evolution is not emphasized.