Final answer:
Oxygen, water, and food are the three essential things humans need to stay alive.
Step-by-step explanation:
Humans need three things to stay alive: oxygen, water, and food.
- Oxygen: Humans cannot survive for more than a few minutes without oxygen. Oxygen is needed for respiration, which is the process of taking in oxygen and releasing carbon dioxide.
- Water: Humans can only survive for a few days without water. Water is essential for various bodily functions and makes up a significant percentage of our body composition.
- Food: Humans can survive for several weeks without food. Food provides the energy, building materials, and substances needed to control body processes.