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Evolution

Biology

THEORIES OF EVOLUTION

THEORIES OF EVOLUTION   ORGANIC EVOLUTION Organic evolution is the sum total of adaptive changes from pre–existing or old forms that has taken place over a long time resulting in diversity of forms, structures and functions among organism. The basis of evolution is that all organisms have pre–existing ancestors.    Evidences of evolution Fossil record: A fossil is an impression of a plant or an animal that lived a very long time ago. The age of fossil is determined using radioisotope dating. Fossils are normally preserved in sedimentary rocks. Depending on the source, fossil records can be referred to as geological or paleontological or archaeological or historical record. Geographical distribution: Based on the effect of climate on all living things, variations in their forms, structures and functions can occur. After several years of isolation, organisms of one climate tend to differ slightly from organisms of another climate. Comparative anatomy: Evolution is… Read More »THEORIES OF EVOLUTION

Biology

EVOLUTION – WELL EXPLAINED

EVOLUTION Meaning of Evolution and Current Concepts Evolution is the development of organisms from pre-existing simple organisms over a long period of time. It is based on the similarities in structure and function that is observed in all organisms. All are made up of cells, and similar chemical compounds are present. This indicates that all organisms may have had a common origin. Evolution seeks to explain the diversity of life and also to answer the question as to the origin of life, as well as its present state. The Origin of Life Human beings have tried to explain how life began. Currently held views are listed below: Special creation -life was created by a supernatural being within a particular time. Spontaneous generation life originated from non-living matter all at once. e.g. maggots arise from decaying meat. Steady state – life has no origin. Cosmozoan – life on earth originate from… Read More »EVOLUTION – WELL EXPLAINED

Computer-Studies

INFORMATION EVOLUTION

  Evolution of information and communication technology (ICT) has passed through different stages, namely; invention of printing stage, invention of radio and television stage, invention of computer stage as well as linking up computers with information and communication technology (ICT).   INVENTION OF PRINTING: This is a stage in which printing technology has been invented. It involves the use of machines to produce master copies of information printing technology made it possible for a large quantity of master copies to be produced at the same time.   INVENTION OF RADIO AND TELEVISION: (a) RADIO: A radio is a method of information transmission by the use of electromagnetic waves that is without using a connecting wire, it is a voice transmission facility which facilitates the picking up of broadcast messages by any of the bands on the radio. The wave bands include short wave (SW) bands, Amplitude Modulation (AM) and Frequency Modulation… Read More »INFORMATION EVOLUTION

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