1. Air enters the nostrils.
2. Air passes from the trachea to the bronchi
3. Air diffuses from the alveoli to the blood cells.
4. Oxygen enters the blood cells.
5. Blood transports oxygen to other cells.
The climate? That would fit I suppose.
Replication from formation and separation of the strands
Endocrine. Because insulin is a hormone that are produced in the endocrine gland such as pancreatic gland
