The Incense Route was a series of important ancient trade routes linking Egypt to India by way of Arabia. The incense trade flourished between the 3rd century BCE and the 2nd century CE, during which time these routes played a vital role in the transport of frankincense and myrrh from Arabia; spices, ebony, and textiles from India; and wood, feathers, hides, and gold from East Africa. Spectacular evidence of the ancient trade can be seen in 16th-century BCE Egyptian frescos that depict what? Discuss