Select the correct and entire main clause of the sentence. my brother attends notre dame university. the main clause

By definition a clause is made up of a subject, a verb phrase and, sometimes, a complement.

So the only clause and also main clause is My brother attends Notre Dame University.My brother is the subject; attends the verb in present; Notre Dame University adverbial adjunct of place. To choose a main clause there should be two clauses. But this is not the case in this example.

well if you have a lion for example it will kill you and that's why you shouldn't have and exotic animal

you need need more details so we can understand what your asking us.