You can't see them without a microscope, nor can you smell or taste them individually.
Hello! The most practical solution would be to build pedestrian-friendly walkways.
First, you can eliminate C (increasing taxes) because it would mean less people would be able to afford medical treatment or visiting a doctor.
Now, we can eliminate choice A. Purchasing a bicycle for each household would not be practical because it would be costly and increase taxes. Plus, the money could be going to more beneficial uses.
At first, D sounds reasonable, however, not only would it would increase taxes, it wouldn't be practical because many senior citizens have joint problems and the intense exercise equipment found at gyms would not best suit them.
Hope this helps! :)
Is is called chemotherapy
Answer:
engine exhaust, domestic heating, volcanic eruptions
Explanation:
