Answer:
Facts
Explanation:
Adjectives are words that modify nouns, noun phrases, and pronouns, providing detail about their qualities or state of being. Adjective clauses are groups of words containing a subject and a predicate (clauses) and providing additional information about the noun, noun phrase, or pronoun. They begin with relative pronouns (e.g. <em>who, whom, whose, that, which</em>) or relative adverbs (<em>when, where, why</em>).
In the given example, the adjective clause is <u><em>that everyone should know.</em></u> The word the clause modifies is the noun<em> </em><u><em>facts</em></u>: <em>facts that everyone should know</em>, providing additional information about it (the sentence <em>This course deals with facts</em> is also correct, just lacking detail).
