The environmental impacts that can result from large algae bloom in the Great Lake would include fish kills and the existence of dead zones. Hence, II and III would be the right option.
Algae blooms in aquatic ecosystems are usually caused by the enrichment of water bodies in the ecosystems. The bloom of algae limits the smaller aquatic plants from getting sunlight for photosynthesis.
Consequently, the small aquatic plants start dying off and decomposing, leading to a reduction in the amount of dissolved oxygen in water bodies. Reduction in dissolved oxygen eventually leads to the death of aquatic lives such as fishes and zooplankton.
Thus a low oxygen zone incapable of supporting life, also known as dead zones, is created in the water bodies as a result of algae bloom.
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