Explain how the use of fertilizers by farmers affect the oxygen level in waterways.
A - Fertilizers run off into waterways which cause a rapid growth in bacteria and eventually deplete the oxygen levels.
B - Fertilizers run off into waterways which cause rapid growth of tiny plants and eventual depletion of oxygen levels.
C - Fertilizers run off into waterways and are consumed by fish which in turn deplete the oxygen levels.
D - Fertilizers run off into waterways and react with the oxygen, thereby depleting the oxygen levels.
Answer: B - Fertilizers run off into waterways which cause rapid growth of tiny plants and eventual depletion of oxygen levels.