Zipcar was developed to adapt to customers' changing transportation needs. zipcar’s success is because it was able to create a venture that satisfied these unfulfilled needs. this is an example of what?

This is entrepreneurship. One of the main reasons for creating a business is to fill a need that isn't being met by other enterprises in the general area. By creating a business that has a specialized area of expertise, an entrepreneur can gain customers who had previously been sufficing on other companies with services and items that were not meeting all the requirements they were looking for.