If it's only regarding the invention of a specific dental equipment, it'll be to inform. the student is preparing to share their knowledge on the dental drill.
to persuade is usually the purpose when there's a question or an argument being raised, and in this case, it doesn't sound like anyone would be against dental drills. dental drills is also a fairly dry topic, so it's doubtful that the student would be aiming to entertain. it isn't a demonstration because the student likely isn't giving a step by step how to in regards to using a dental drill.
Sharp-fanged cat would be the best answer in my opinion.
<h2>B: the amount of moisture in the Earth’s atmosphere. </h2>
As by definition humidity is the concentration of water vapours in the air. So the best answer is B.
Answer:
how many boys to girls there are. in china there is a drastic difference between the two which can/will cause future population shrinkage issues
