Natural systems are systems that came into being by natural processes. Like the rain cycle.
Technological systems are those to whom people intervened or designed. Like diverting water for a rider for land irrigation.
Minimize any apps/webpages on it you have open (your background has to be visible), left click with the mouse, hit Personalize, and it should have Backgrounds on the page if you scroll down. You can hit Browse to look through your files on the desktop for what you want.
Answer:
Quick Communication & Correspondence
Explanation:
Another main advantage of using computers in the education field is the improvement in the quality of teaching-learning process and communication between students & teachers. For this, they use Microsoft PowerPoint to prepare electronic presentations about their lectures.