Answer:
Bicycles can influence the level of pollution positively due to no usage of gas, which exudes carbon dioxide into the atmosphere and contributes to the greenhouse effect. If more people rode bicycles everyday as opposed to public transportation or personal vehicles, pollution levels would fall significantly.
<span>Foreshadowing is the answer</span>
The sentence should be placed after sentence 4. The following sentence is a conclusion, as it sums everything up.
