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Repeated appearance of algal blooms in a lake is a sign of

1. lack of nutrients in the water
2. low dissolved oxygen in the lake
3. high availability of nutrients
4. no herbivores present in the lake

Correct answer: high availability of nutrients

Solution

Recurrent algal blooms indicate a high availability of nutrients (N, P) - eutrophication. The stored 'no herbivores' is not the cause.

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