Answer:
Because models are cheaper and don't take up as much space. They are good for presentations when you want to present something with ease. It's also okay if something happens to the model because it doesn't actually effect what the presenter may be presenting. Like for example, a car model is much smaller, you can easily display the car to your audience without difficulty, and the model would be much lighter and portable than an actual car itself.
Step-by-step explanation:
:D