Answer:
The presence in the air of one or more contaminants in such a concentration and of such duration as to cause a nuisance or to be injurious to human life, animal life or vegetation.
For the answer to the question above, I would say that the Netherlands
was one good example of what are the dangers when creating polders that
are below the sea level. The water always goes where there is a lower
level of the land. That's when the flooding occurs. You can't have a
flood on the mountain. Water will always find its way to lower areas of
land.
B since there is a high chance of birth and a low chance of death
1. We should not
2. We should not
3. We should
4. New towns do
5. Petrol powered cars are not