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Why nephridia in earthworm that are basically similar in structure classified into three types? Mention the names of each.

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The nephridia in earthworm are categorised into three distinct types on the basis of the location they are the found in. These three types are: -

- Integumentary nephridia: these are found attached to the wall of the 3rd segment till the last one
- Septal nephridia: these are located on both the sides of intersegmental septa of the 15th segment till the last one
- Pharyngeal nephridia: these are found as three paired tufts located in the 4th , 5th and 6th segment.

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