Final answer:
The dependent clause in the given sentence is 'If anyone moves', which provides additional information but relies on the main clause to complete the meaning.
Step-by-step explanation:
The dependent clause in the sentence 'If anyone moves, he will be angry' is 'If anyone moves'. This clause cannot stand alone as a complete sentence because it does not express a complete thought and relies on the rest of the sentence for its meaning. Clauses that begin with subordinating conjunctions, such as 'if' in this case, are typically dependent clauses. They are essential to the sentence because they provide additional information, but they need the main clause to form a complete statement.