Estimate - A prediction of measurement or what the results might end up being., Evidence - Observations, data, or measurements collected to understand and explain a science concept., Explanations - Scientists use evidence (data collection, observations, or measurements) to explain science concepts., Hypothesis - A prediction of what will happen based on background information (never a guess)., Investigation - Organized scientific study of natural world. Includes: making systematic observations, asking questions, gathering information, analyzing data, summarizing results, drawing conclusions, and communicating results, Opinion - How someone 'feels' about a concept., Model - Replica or representation of a structure or object., Procedure - The steps followed when doing an experiment (scientific method)., Record keeping - Measurements or observations that are collected during investigations or experiments., Replicate (repeat) - When trials in an experiment are done over and over.,

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