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science way of learning more about the natural world that provides possible explanations to questions and involves using a collection of skills scientific law a rule that describes a pattern in nature but does not try to explain why something happens scientific theory a possible explanation for repeatedly observed patters in nature system collection of structures,cycles and processes that relate to and interact with ech other life science study of living systems and how they interact earth science study of earth systems and systems in space, including weather and climate systems and the study of non-living things such as rock, oceans, and planets physical science study of matter,which is anything that takes up space and has mass, and the study of energy, which is the ability to cause change technology use of science to help people in some way hypothesis reasonable guess that can be tested and is based on what is known and what is observed infer to draw a conclusion based on observation controlled experiment involves observing the effect of one thing while keeping all other things constant variable factor that can be changed in an experiment constant variable that is not changed in an experiment model any representation of an object or an event that is used as a tool for understanding the natural world; can communicate observations and ideas, test predictions, and save time, money, and lives critical thinking involves using knowledge and thinking skills to evaluate evidence and explanations