Agroup of words that's missing a subject, a verb, or a complete thought is called a/an

Hey, can you guys keep awnsering my questions

Which of the following is an example of a periodical?

Which sentence corrects the error in pronoun-antecedent agreement? new team members should pick up his or her jersey from the activities office. if a team member is unable to attend a practice, he or she must provide a doctor's note. if students wish to compete, he or she must maintain a grade point average above 2.5. students are not permitted to attend away games without the consent of her parents or guardians.