Is the part of a sentence containing the verb and any direct or indirect object, but not the subject.

no its not a sentence. to have a sentence you must have a subject and a verb but a do and and io are optional

two factors or characteristics of a chapter that might make it difficult to read would be words i don't understand, or if i don't fully understand what's going on in the chapter. strategies i can use to get through the difficult material would be a dictionary, and re-reading previous chapters to get a better grasp of what the author is trying to say.

what excerpt? i would generally think a.