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History Of Computers Generations

Significant Developments which led to Modern Electronic Computer History of computer generation 1-5 Year 1845 Boolean Algebra was developed by George Boole. 1890 Herman Hollerith used Punched Cards for storing data. 1900 Valdemar Poulson developed recording devices like tapes and drums coated with thin films of magnetic oxide. 1906 Lee do Forest invented Thermionic valve. …

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Interdependence of Plants and Animals

The two principal groups of living organisms are plants and animals. From the very early phase of evolution both the communities have lived together side by side in an intimate association to form the biotic environment or biosphere. In a stable ecosystem the plants and animals form a delicate nutritional interdependence which with minor fluctuations …

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