Which source would be the most credible choice for researching tornadoes in the united states?

a photo-sharing site containing personal pictures of tornadoes

a file-sharing site containing fictional stories about tornadoes

a personal blog

a government agency’s weather website

 D) a government agency’s weather website.

Explanation: When researching a topic, we need to be careful with the sources that we use. According to the topic that we are researching, we need to find the most reliable sources, because in this way, we can be sure that the information that we obtain, is correct and trust worthy. If we are looking for information about tornadoes in the United States, the most credible source would be a government agency's weather website.

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sinco

1. the relationship between a pronoun and its antecedent- reference

reference refers to the relationship between mainly pronoun and another unit of grammar- noun phrase or noun.

2. a singular noun naming a collection or group- collective noun.

collective noun refers to the kind of noun which refer to the name of people, thing or anything in collective. for instance bundle of sticks, herein 'bundle' is collective noun.  

3. a modifying clause whose subject and/or verb is implied- elliptical clause

it is a clause in which words are being left out. on the other hand, the missing word is understood due to the logic or pattern of the sentence.  

4. two or more nouns and/or pronouns serving the same grammatical function and followed by a pronoun that references one or all nouns- compound antecedent

compound antecedent refers to which is made up of two or more words which are joined by 'or' or 'and.'

5. an adjective clause introduced by a pronoun- relative clause.

relative clauses are the clauses which begin with the relative pronouns such as when, where, which, that or who. the noun that precedes, relative pronouns identify or define that noun.  

6. the word, phrase, or clause to which a pronoun refers- antecedent.

antecedents refers to the phrases, clauses or words which are replaced with one of the third personal pronouns.