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How are we using the sea? How did we use it in the past?

We use the sea exactly in the same way we use it today. the only difference is that now we have more modern instruments to get things by the sea. Basically we use the sea to communicate, for the trade, for fishing. Nowadays we also study the sea with more interest than in the past, also because due to the pollution the sea needs to be protected, and to do it the monitoring activity and the study of the normal state of seas, is very important.