Which of the following is an academic search engine that searches across multiple databases?

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Cross-database searching in academic tools lets you pull results from several scholarly databases at once, rather than limiting you to a single collection. This broad approach helps you uncover more literature, including articles that may appear in different subject databases or publishers’ collections.

PubMed focuses on biomedical literature and functions as its own database of records, so it doesn’t search across multiple databases. Chrome is a general web browser, not an academic search tool. DuckDuckGo is a general search engine that indexes the broader web, not a curated set of scholarly databases. Power Search, by contrast, is designed to query multiple databases from one search box, bringing together results from diverse scholarly sources in a single results list. That capability is why it fits the idea of an academic search engine that searches across multiple databases.