Read the paragraph from the section "The rise of Islam." What conclusion is supported by this paragraph? "Under the caliphs, life and culture in great cities blossomed. Some of these cities included Cairo in what is now Egypt and Damascus in what is now Syria. Poets, scientists, and philosophers wrote thousands of books. They also developed the number system that we all use today. Inventors came up with technologies like the pinhole camera, soap, windmills, and surgical tools."

1. Poets and philosophers needed a number system in order to write their books.
2. The ideas developed in Islamic cities are still important to the modern world.
3. The most important Islamic poets and scientists came from Cairo and Damascus.
4. The inventions we use today have not changed since the Middle Ages.