The earthworm is indigenous to Europe, but now can be found in Western Asia and North America. Earthworms live in moist soil, and don't have lungs or any other respiratory organs so they breathe through pores in their skin. Their skin must stay wet in order for oxygen to permeate their skin. Earthworms eat soil and decaying vegetation. A fun fact is that they have both male and female reproductive organs and reproduce by joining their clitellums together. Then they make a cocoon which holds the fertilized eggs together until they hatch.
Here is a link that full describes the dissection process:
http://youtu.be/m5P7s30NjxE
Sources:
http://crescentok.com/staff/jaskew/isr/biology/biolab31b.htm
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