In earthworms,where is hemoglobin found?

Assertion : Typhlosole increases the effective area of absorption in the intestine.
Reason : Typhlosole,present in the intestine,is the characteristic feature of cockroach.

Earthworms possess:

The prostomium is $...............$

Mention the function of the following:
Body wall in earthworm

What is the function of the typhlosole in an earthworm?