Review the responses below; then SELECT ALL the reasons why we use scientific models. a Models are used when systems are too expensive, expansive or impossible to use. b Models help you understand complex systems. c Models are always expensive. d Models allow exploring very small or very large systems.
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The valid reasons for using scientific models from the provided options are:
a. Models are used when systems are too expensive, expansive or impossible to use.
b. Models help you understand complex systems.
d. Models allow exploring very small or very large systems.
Option c ("Models are always expensive") is not a reason for using scientific models, so it should not be selected.
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