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It is defined as a non ability of the different species to perform inter breeding. It helps to make the separate identity of species. If it does not exist the characters will inter mix and the distinction of species will diminish. So, it will be ...

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There is a phenomenon in which the organisms have many forms known as polymorphism. They occur in colonies. The honey has different stages of larva and pupa. The colony has different type of individuals. They are drone, worker and queen respectively. They also occur in ...

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The species constitute a group of organisms which are quite alike in morphology, behavior and function. But it is not necessary that they resemble in all these features. The reason for their non resemblance is due to many factors. There developmental stages in life cycle ...

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The hierarchy is an organizational form in which some components regulate the activity of other components. They are of different types and can be physical, biological or ecological. The physical hierarchy includes the smallest structural units. They can be living or non living. It includes neutron, ...

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The ecology is defined as a branch of biology which deals with almost all aspects of organism and is concerned about its interactions with the environment. Reiter was the first one to use the term ecology. Reiter was also supported by Haeckel. It includes distribution, ...

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