Why nephridia in earthworm that are similar

Question:

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

Solution:

Nephridia in earthworms are similar in structure they are classified into different types based on their location.

1. Septal Nephridia: It is located in both sides of the intersegmental septa from the 15th segment till the end

2. Pharyngeal Nephridia: It is located in the 4th, 5th and 6th segment of the earthworm.

3. Integumentary Nephridia: It is located in the body wall i.e., the integument of the earthworm.

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