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Word Count: 4,297
The Earth mans home is a planet The Earth has special characteristics and these are important to man It is the only planet known to have the right temperature and the right atmosphere to support the kind of environments and natural resources in which plants and man and other animals can survive This fact is so important to man that he has developed a special science called ecology which deals with the dependence of all living things will continue to survive on the planet Many millions of kinds of plants and animals have developed on Earth They range in size from microscopic plant and animals to giant trees and mammoth whales Distinct types of plants or animals may be common in many parts of the world or may be limited to a small area Some kinds thrive under conditions that are deadly for others So some persons suggest that forms of life quite different from those known on Earth might possibly survive on planets with conditions that are far different from conditions on Earth Many persons believe that the Earth is the only planet in the solar system that can support any kind of life Scientists have theorized that some primitive forms of life may exist on the surface of Mars but evidence gathered in 1976 by unmanned probes sent to the Martian surface seems to indicate that this is unlikely Scientist at one time also believed that Venus might support life Clouds always hide the surface of Venus so it was thought possible that the temperature and atmosphere on the planets surface might be suitable for living things But it is now known that the surface of Venus is too hot--an average of 800 F 425 C--for liquid water to exist there The life forms man is familiar with could not possibly live on Venus
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