How do oceans play a part influencing our Earth systems?

Ocean currents act much like a conveyor belt, transporting warm water and precipitation from the equator toward the poles and cold water from the poles back to the tropics. Thus, ocean currents regulate global climate, helping to counteract the uneven distribution of solar radiation reaching Earth's surface.

Explanation:

Well, it plays a part because it is our key to making our Earth called home... The earth is majority filled with water. It plays a part also by giving us water, and many much more things that require water...I can go on forever and say how it gives us food as well... if we never had water, we would never have veggies and crops to keep us alive...

Explanation:

(Don't take it from me... take it from Nature...)