The following sentence contains an adverb clause.
This sentence contains two clauses - an independent clause (We moved) and a dependent/subordinate clause (because our house was too small). Given that the second sentence gives us a reason why they moved, it acts as an adverb, which is why it is an adverbial clause.
D- the librarian found the missing book between two different dictionary's
Symbols are important because they facilitate communication and identification of ideas and other concepts based on what those symbols represent, though they can have literal as well as figurative meanings.Symbols can be used to signify individuals, groups of people, organizations or more ambiguous concepts
