The backbone in animals (vertebrates), known as the vertebral column, is important to protect their spinal cord. The cord is necessary to allow communication with, and movement of, the lower parts of the body. The column also provides support to the axial (central) skeleton for posture.
Carbon dioxide: It diffuses into the blood and is carried to the lungs, where it is exhaled. As you exercise, carbon dioxide is carried to the lungs, where it is exhaled Carbon dioxide is exhaled.
The endoplasmic reticulum basically acts as the brain in a sell, it pack up nutrients and other resources needed and is manufactures and sends the nutrients to other parts of the cell.
