The total sum of all physical and biological conditions of a place, in which we are living, is called its environment. The physical condition includes; the temperature, pressure, light, soil, etc. and the biological conditions includes the plants, animals and microorganisms around it. Any change in one of these conditions can affect the organisms living in this environment. The energy in the environment comes from different sources and these energy can be used in different forms. We can convert one form of the energy to the another, depending on our requirement. The total energy during a physical and chemical changes remains the same, although it is converted from one form to the another.
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