Answer:
To make sure the genes are constantly being expressed
Explanation:
Dorsal Body Cavity: Cranial cavity, enclosed by the skull and contains the brain. Spinal canal, enclosed by the spine and contains the spinal cord.
Ventral Body Cavity: Thoracic cavity, enclosed by the rib-cage and contains the lungs and heart.
Abdominal cavity/Pelvic cavity, contains the digestive organs, spleen kidneys, bladder, and reproductive organs.
Nephron helps the urinary system to rid off metabolic waste in our system.