Задание 38702 ЕГЭ по английскому языку

The scientists are not sure whether the impact of high CO2 levels

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Fish reactions are affected by

Which sense is not used by young fish to seek new habitat?

Scientists have chosen clown fish for their experiments because they

During the experiments the treatments of water were based on

In the environment with the normal level of CO2 fish usually.

What is the most probable explanation for the unusual behaviour of fish under high levels of CO2?