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fertilisers used for agricultural activities get washed away by the rain and into water bodies
Excessive nutrients from fertilisers causes growth of algae
Algae blooms, preventing sunlight from penetrating the surface of the water
Due to the lack of sunlight caused of the blocking of sunlight by the algal blooms, plants start to die. They do not receive enough sunlight for photosynthesis, thus unable to make food and survive.
Bacteria decomposes the plants, taking up the oxygen, causing the water body to be anoxic.
Thus, due to the lack of oxygen, other organisms die.
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