Which factor is the major cause of both prevailing global wind patterns and ocean currents?

Ocean water has different densities

The Great Ocean Conveyor Belt

The sun’s heat is uneven on the Earth

The Earth has a North and South Pole

dynamic equilibrium is the answer.

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.