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Ecological fallacy, also called ecological inference fallacy, in epidemiology, failure in reasoning that arises when an inference is made about an individual based on aggregate data for a group. In ecological studies (observational studies of relationships between risk-modifying factors and health or other outcomes in populations), the aggregation of data results in the loss or concealment of certain details of information.
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helped is the correct answer
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Well, you already labeled some of the purposes of conjunctions but I'll label some more...
1. They create sentences with different styles and different meanings.
2. It's a connector between two sentences, clauses, phrases, or words.
3. Help to create more complex sentences as your ideas become more complex.