Which of the following aided cultural diffusion among ancient peoples? a. trade b. new technology c. poor leaders d. farming.

The correct answer among all the other choices is a. trade. This aided cultural diffusion among ancient people. All the other choices did not. Thank you for posting your question. I hope this answer helped you. Let me know if you need more help. 

It should be at the center of any map going vertically: the prime meridian, as it passes through greenwich,  england, is considered 0 degrees longitude