1. Agree. Because they have easier access for trading heavy amounts of supplies through water and/or can have tourist spots.
2. Agree. Artificial islands made by people exist and are usually made to expand their large cities towards the water. Either that or they could just move inland.
3. Agree. Structures and roads are easier built on flat lands.
4. Agree. 70% of the Earth’s surface is water and making artificial islands is expensive, and some of the land is too ridged and challenging (including climate) to support comfortable human life.
5. Agree. Humans are increasing rapidly, so cities will grow and more people will eventually be in them.
6. Agree. One example is tractors, instead of having dozens of people move across a field to collect crops, a tractor can do it several dozen times faster and more efficient than people in a much shorter amount of time.