Hey there,
Your question states: Why is little known about the Incas? One thing that I know personally is that they knew how to properly grow things. They were actually the best people who knew how to really grown there crops. But the issue was, there were a very few of these people. There little population just grew smaller and smaller. This would conclude that your correct answer would indicate to be "<span>There were so few of them"
Hope this helps</span>
"Ornate and patterned" would be the best option when describing the architectural style of the Islamic Golden Age, although there were exceptions of course.
Aristarchus’ only extant treatise is “On the Sizes and Distances of the Sun and Moon.” In it he calculated the diameter of the Sun as about seven times the diameter of the Earth, thus estimating the Sun’s volume as about 300 times the volume of the Earth
If you know about vertical or horizontal businesses that would be a good answer
