Algal bloom in a lake ........

Environment and Ecology Pollution

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Algal bloom in a lake:

leads to O2 depletion

increased CO2 level

kills fishes and other organisms

All of the above

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Explanation:

Algae tend to grow very quickly under high nutrient availability, but each alga is short-lived, and the result is a high concentration of dead organic matter which starts to decay. The decay process consumes dissolved oxygen in the water, resulting in hypoxic conditions. Without sufficient dissolved oxygen in the water, animals and plants may die off in large numbers.