1. Hierarchy of categories is a system of arranging taxonomic categories in a descending order on the basis of their relative dimensions.

    Hierarchy of categories is a system of arranging taxonomic categories in a descending order on the basis of their relative dimensions.

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  2. Taxonomic category is a rank or group of organisms developed on the basis of their fundamental characteristics, similarities and dissimilarities.

    Taxonomic category is a rank or group of organisms developed on the basis of their
    fundamental characteristics, similarities and dissimilarities.

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  3. Advanced organisms are the ones which have evolved recently and usually possess more complex and elaborate structure.

    Advanced organisms are the ones which have evolved recently and usually possess more complex and elaborate structure.

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  4. Primitive organisms is one which has ancient body design that has not changed very much.

    Primitive organisms is one which has ancient body design that has not changed very much.

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