The body segments in earthworm are called

Hearts of Pheretima are situated in the segments

The blood of $Pheretima$ is:

What type of digestion is observed in earthworms?

In earthworm,which of the following statements is correct regarding its development?

$A$ transverse section of $Pheretima$ taken through the $10^{th}$ segment is observed under a microscope. Which of the following structures can be observed in the section?