The dependant variable would be the salmon, because they depend on the water and pollution levels to give a result.
Answer:
precipitation is the answer of this question
The urban areas are more likely to have smog than the rural areas.
Urban area can be referred to as the town or city with advances an developments. Since the urban areas have more population density, more electronic items, vehicles and also industries, that is the reason why they are more likely to produce the smog or any other form of pollution.
Smog is a type of air pollution formed dye to the combination of smoke and fog. The most common source of smog is the burning of coal. This can be either due to industries or the fuels of vehicles. Fog can be of two types: Photochemical smog and industrial smog.
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