Define Invertebrate Zoology
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Invertebrate zoology is the subdiscipline of zoology that consists of the study of invertebrates, animals without a backbone (a structure which is found only in fish, amphibians, reptiles, birds and mammals.) ... Single-celled organisms or protists are usually not included within the same group as invertebrates.
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animal which which does not have backbone ( spinal chord surrounded by cartilage ) are called invertebrates .
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