Often computers are used to run weather models because some models are very complex. For example, predicting what the weather will be like in a week involves many hundreds of pieces of data. If the model doesn't make an accurate prediction, scientists can adjust to calculations. In this way the model improves over time. A. Because Mexico models are based on numbers, they help scientists see patterns more easily.

B. Often computers are used to run weather models because the models are very complex.

C. For example, predicting what the weather will be like in a week involves many a hundreds of piece of data.