The septal and pharyngeal nephridia open into alimentary canal and are of enteronephric type. It is an adaptation for

The septal and pharyngel nephridia of enteronephric type, open into alimentary canal. Their presence is an adaptation for :

In earthworm, pharyngeal nephridia occur in segments

Alimentary canal has single opening in

Alimentary canal has single opening in

Mouth is formed as a secondary opening of alimentary canal in

Mouth is formed as a secondary opening of alimentary canal in

Pharyngeal nephridia of Pheretima are found in segments

Pharyngeal nephridia of Pheretima are found in segments

Pharyngeal nephridia of Pheretima are found in segments