
The correct answer to the question "A person who treats sick animals is called a:" is: Veterinarian
Explanation: A veterinarian is a professional who is qualified to treat diseased or injured animals. They perform medical procedures and surgeries on animals and provide healthcare analogous to the work of doctors in human medicine. Here’s a short breakdown of the other options provided:
The role of the veterinarian is crucial in ensuring the health and welfare of animals, encompassing similar medical disciplines as human healthcare but tailored to different species.
Fill in the blank with the correct option. 
The teacher believed that the student’s sudden lack of interest in class was an ..........., as he had always been enthusiastic and attentive.
What comes next in the series? 
\(2, 6, 12, 20, 30, \ ?\)