Is the group of words a sentence or a run-on sentence?
My rabbit makes the cutest face when he nibbles his food he scrunches up his nose.
a. sentence
b. run-on
It is a run-on sentence, because there needs to be a comma after 'his food'. If there were, it would be a normal sentence, but since there isn't, it is a run-on sentence, meaning it lacks the appropriate punctuation mark.
