The spinal cord begins at the occipital bone and extends down to the space between the first and second lumbar vertebrae; it does not extend the entire length of the vertebral column.
Earthworms are invertebrates, lacking a skeleton. To support and shape the body, they are filled with coelomic fluid. Earthworms sometimes appear to have a belt or saddle around their bodies; this is a clitelum, a structure containing maturing eggs.
Earthworms breathe through their moist skin. Gas exchange takes  place directly there.   The Earthworm's body has to stay moist & slimy because  it allows oxygen to be dâ¦iffused from air through the skin. This  allows the worm breath because they do not have lungs.   They do not breathe as we do- they take in oxygen directly through  their skin, and give off carbon dioxide the same way.   They use their skin [integument] to support the process of gaseous  exchange known as transpiration.   Through their pores.