Complete the sentence about Lagoa das Sete Cidades with the correct year: As the existence of a eutrophication process in Sete Cidades lake was already known since the 1980s, the rise of cyanobacteria blooms was not unexpected by ______.
Answer and explanation
Correct answer: D. 2000
The eutrophication of Sete Cidades lake had been known from the 1980s, so the rise of cyanobacteria blooms was not unexpected by 2000. In winter and spring diatoms take over from the cyanobacteria.
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