Answer:
Dogs are extremely “communicative” and use their body language and barking to express their feelings. Cats, on the other hand, usually hunt on their own, and do not need any company. Certainly they can live together, although they do not require to be with one another or with anyone else.
Explanation:
The word "Yet" sounds appropriate but if this is multiple choice I'd like to know the choices.
C. the word Have shows you it is past tense but it does not end in ed so it is no a past participle.
B: An introduction begins an essay, while a conclusion ends it