- A lung is a kind of organ for breathing air
- In order to breath air you must take in air
- Therefore, a lung is a kind of organ for taking in air

- A lung is a kind of organ for taking in air
- The lungs are a part of the respiratory system
- So, the respiratory system takes in oxygen from the air

- Converting oxygen from air into oxygen from blood means absorbing oxygen from air into the blood
- Breathing is when a lung converts from oxygen in air into oxygen in blood
- So, blood absorbs oxygen in the lungs

- Blood absorbs oxygen in the lungs
- If something is absorbed by something else, then that something is transferred to that something else
- So, the lungs transfer oxygen to the blood

- The lungs transfer oxygen to the blood
- The lungs are a part of the respiratory system
- Hence, the respiratory system transfers oxygen to the blood

- The respiratory system transfers oxygen to the blood
- Blood is a part of the circulatory system
- Hence, the respiratory system transfers oxygen to the circulatory system

- The respiratory system transfers oxygen to the circulatory system
- To transfer can mean to move
- So, the respiratory system moves oxygen to the circulatory system

- The respiratory system takes in oxygen from the air
- The respiratory system moves oxygen to the circulatory system
- So, the respiratory system takes in oxygen from the air to be moved by the circulatory system

So, the respiratory system takes in oxygen from the air to be moved by the circulatory system
Q: Different systems of the human body perform different functions. Which system takes oxygen from the air to be moved by the circulatory system?
Context:
- The lungs are a part of the respiratory system 
- Blood is a part of the circulatory system 
- Converting oxygen from air into oxygen from blood means absorbing oxygen from air into the blood 
- Breathing is when a lung converts from oxygen in air into oxygen in blood 
- A lung is a kind of organ for breathing air 
- To transfer can mean to move 
- If something is absorbed by something else, then that something is transferred to that something else 
- In order to breath air you must take in air