- As the use of public transportation increases , the use of automobiles decreases
- Bus is a kind of public transportation
- Therefore, as the use of buses increases, the use of automobiles decreases

- As the use of buses increases, the use of automobiles decreases
- The use of automobiles causes pollution to the environment
- Hence, as the use of buses increases, the pollution caused by using automobiles will decrease

- "Cells are a part of the body " is not a useful statement here

So, as the use of buses increases, the pollution caused by using automobiles will decrease
Q: In what way do transit systems, such as buses, benefit society?
Context:
- As the use of public transportation increases , the use of automobiles decreases 
- Bus is a kind of public transportation 
- The use of automobiles causes pollution to the environment
- Cells are a part of the body 