What is inside the containers and what could happen if contact is made and directions what to do if anything happens
<span>Aerobic exercise helps to:
-Builds stamina</span>
The respiratory system includes the pharynx.
The respiratory system is a biological system consisting of specific organs and structures used for gas exchange in animals and plants. The anatomy and physiology that make this happen varies greatly, depending on the size of the organism, the environment in which it lives and its evolutionary history.