When repeated generation after generation, natural selection leads to the evolution of new species that are more effectively adapted to their particular environment. The traits or characteristics that are associated with high rate of survival and reproduction of those species are the most likely ones to be passed on to the next generations. You know that members of each species vary greatly in their physical structure and behaviour.
Physiological as well as behavioural changes that occur due to the evolutionary process are so slow that they become visible after hundreds of generations.Įvolution occurs through the process of natural selection. It is estimated that the characteristics of modern human beings developed some 2,00,000 years ago as a result of their continuous interaction with the environment.Įvolution refers to gradual and orderly biological changes that result in a species from their pre-existing forms in response to the changing adaptational demands of their environment. In this world, there are millions of different species of organisms differing in a variety of ways.īiologists believe that these species were not always like this they have evolved to their present form from their pre-existing forms. The uniqueness of individuals results from the interaction of their genetic endowments and environmental demands. You must have observed that people differ with respect to their physical and psychological characteristics.
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