Give me some examples of why is it important to understand how ocean currents flow.

By moving heat from the equator toward the poles, ocean currents play an important role in controlling the climate. Ocean currents are also critically important to sea life. They carry nutrients and food to organisms that live permanently attached in one place, and carry reproductive cells and ocean life to new places.

Explanation:

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a corroding iron, if that's one of your choices

metric time was an attempt to create a standard unit of time based off of 10, but it never took off an is not included in the metric system (si)