201. Caries is a condition related to teeth, and a dentist should be consulted.
202. In eye donation, the cornea of the eye is used.
203. Neptune has 13 moons.
204. The rarest blood type in humans is AB-.
205. The lowest region of the earth’s atmosphere comes between the earth and the stratosphere, and it’s called the troposphere.
206. Venus is the hottest planet in our Solar system.
207. The heating element of an electric heater is made up of nichrome.
208. In the BTU system, one BTU is equal to 1055 Joule.
209. For water purification, we use chlorine.
210. Insulin regulates the metabolism of sugar.
211. Gunpowder is a mixture of potassium nitrate, powdered charcoal, and sulphur.
212. The periodic table was created by Dmitri Mendeleev.
213. The term PVC used in the plastic industry stands for Polyvinyl chloride.
214. Analgesics are drugs that block sensory nerves and prevent the patient from feeling pain.
215. Dead red blood corpuscles are stored in the spleen.
216. Photosynthesis takes place in the leaves of plants.
217. Algae are responsible for the largest amount of oxygen on Earth.
218. The luster of diamond is due to total internal reflection.
219. The type of glass used in making lenses and prisms is flint glass.
220. EEG records the activity of the brain.

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