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488. Which Animal that never drinks water in its entire life ?

The tiny kangaroo rat found in the south western deserts of the united states does not drink water in its entire life. Kangaroo rats are an important part of desert life. They are often eaten by other animal for the water in their bodies. The rats can run very fast, covering 6 meters in one second, Because of their long powerful legs and the strong tail which resemble those of the kangaroo they are called the kangaroo rats. They grow to about 38 cm long, including a tail of 20cm.
 
487. How do meteorologists forecast the weather ?

Weather forecasting is a prediction of what the weather will be like in an hour, tomorrow, or next week. Weather forecasting involves a combination of computer models, observations, and a knowledge of trends and patterns. By using these methods, reasonable accurate forecasts can be made up to seven days in advance.
Weather forecasts are made by collecting as much data as possible about the current state of the atmosphere (particularly the temperature, humidity and wind) and using understanding of atmospheric processes (through meteorology) to determine how the atmosphere evolves in the future.
 
486. Why is yawning infectious?

Yawning is a result of increased levels of carbon dioxide in the lungs – often occurring as a result of a lower breathing rate when the body relaxes.
If a group are all relaxing together, it is probable they’ll all reach the same elevated level of CO2 at approximately the same time.
Hence they may feel the need to yawn at the same time.
 
485. How many planets do not have natural satellites ?

Two planets, Venus and Mercury, are the only planets in the solar system that do not have any natural satellites or moons. Mercury, Venus, Mars and Earth are inner planets. The outer planets are Jupiter, Uranus, Saturn and Neptune.
Earth has one large natural satellite, known as the Moon; and Mars has two tiny natural satellites, Phobos and Deimos.
 
482. What is Pacemaker ?

A pacemaker is a small device that's placed in the chest or abdomen to help control abnormal heart rhythms. This device uses electrical pulses to prompt the heart to beat at a normal rate.Pacemakers are used to treat arrhythmias (ah-RITH-me-ahs). Arrhythmias are problems with the rate or rhythm of the heartbeat.
 
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