What is wrong with this sentence: "He remembered the word silhouette while cutting a shape from the black paper and began to wonder where it came from."

Conclusion is the answer

Adjective clauses  begin with words such as that, when, where, who, whom, whose, which, and why. an essential (or restrictive)  adjective clauseprovides information that is necessary for identifying the word it modifies. so for example*** wrong= i the man gave me direction. example right ( i the man who gave me the  direction.

You cant, you're going to have to go their page, which is to do that.