combine your keywords with ___ tells the search tool that all the words must be present

### Why this is right **AND** is a Boolean operator, a word that tells a search tool how to combine search terms. It narrows results to pages containing every keyword you entered, so it matches the rule in the question. ### The concept A **keyword** is a word or phrase that describes what you want to find. When you connect keywords with Boolean operators, you can control which results the search tool returns. For example, searching `climate AND agriculture` asks for results containing both terms. The search may return fewer results than a search with just one keyword, but those results are more likely to cover both topics. ### The other options - **B. OR**: OR asks for results containing either keyword, or both. It usually broadens the search, so it does not require every word to be present. - **C. NOT**: NOT excludes results containing the word after it. It removes a term rather than requiring all keywords. - **D. By**: “By” is not a standard Boolean operator for combining search terms, though it can be used as an ordinary search word. ### Watch out AND and OR are easy to confuse: AND makes results more specific by requiring all terms, while OR makes results broader by accepting either term. ### Terms - **Boolean operator**: A word or symbol used to set rules for combining or excluding search terms. - **Keyword**: A word or phrase entered into a search to find relevant information. - **Search tool**: A website or program that finds information matching the terms you enter. ### Remember Use AND when every keyword must appear in the search results.