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.
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on other side of the world
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Oil spill have a tremendous impact on the ocean environment, the new technique called bioremediation in which the bacteria pull the oil down to the ocean floor.
<h3>What is bioremediation?</h3>
Bioremediation is the method of cleaning oil from the waterbeds, which accidentally spill into seas and oceans.
The method use bacteria to clean, the bacteria pulls the oil down to the floor of water bodies.
Thus, the new technique called bioremediation in which the bacteria pull the oil down to the ocean floor.
Learn more about bioremediation.
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