Which of the following is the best example of an observational study? Matthew investigates the effects of a gluten-free diet compared to a traditional diet for golden retrievers. Gina investigates the

Which of the following is the best example of an observational study? Matthew investigates the effects of a gluten-free diet compared to a traditional diet for golden retrievers. Gina investigates the correlation between daily high temperature and animal behavior. Katlynn investigates the effects of eating breakfast compared to not eating breakfast on weight loss. Eric investigates the effects of a name brand cold medicine compared to a generic cold medicine.

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