Compare the external and internal environment of the human body. What are their similarities and differences?

The similarities are quite few. They consist in the fact that inside the body and outside there are various chemical elements, water and air. There are many differences. First of all, the external environment is constantly changing, and the internal one remains constant due to homeostasis. Inside our body, approximately the same temperature is maintained, and bacteria live there that help us with digestion. Our body is a system that operates stably under normal conditions, but the environment cannot be called stable.