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.
The human body has 10 organ systems (actually 11 if you include the integumentary system). From the 11 systems pick one system and describe how its loss would Body Mass Index Design a modular system that calculates and display a person's body mass index (BMI).