Answer:
The sentences that do not use a semicolon correctly is Chinchillas are fascinating; and they live longer than most rodents.
What is semicolon used for?
The use of a semicolon is known to be one that helps to link two linked independent clauses and it is lone that is often used in the place of comma and a coordinating conjunction.
Therefore, do Make sure if you use the semicolon that the connection between the two independent clauses is said to be clear without any kind of coordinating conjunction.
Thus, The sentences that do not use a semicolon correctly is Chinchillas are fascinating; and they live longer than most rodents.