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.
Its reddish tinge is due to the oxygen-carrying pigment hemoglobin in the blood. The earthworm's body is made up of segments. On each segment, except the first and last, are four pairs of tiny bristles called setae that help the worm move through the earth. It also has five pairs of hearts in the front of its body.The hearts help circulate the worm's blood.ts reddish tinge is due to the oxygen-carrying pigment hemoglobin in the blood. The earthworm's body is made up of segments. On each segment, except the first and last, are four pairs of tiny bristles called setae that help the worm move through the earth. It also has five pairs of hearts in the front of its body.