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observations that deal with descriptions that cannot be expressed with numbers
a representation of a complex object or process that helps people understand things that cannot be observed directly
the diverse ways in which scientists study the natural world and propose explanations based on the evidence they gather
a possible explanation for a set of observations or possible explanation to a scientific question
the one variable that is purposely changed in an experiment to test a hypothesis
the amount of matter in an object in a particular space (mass of an object divided by its volume)
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