What caused Ellie to lose her ability to serve as a search-and-rescue dog?

Answer 7th question pls asap i need

Read the following entries from the online etymology dictionary based on the information above, what does the world microcephaly most likely mean? a. dull or unintelligent b. worldly thinking c. having a large head d. bigger than usual

Those are books that need to be returned to the library what is the antecedent of the pronoun those