Explain why glaciers are called nature's bulldozer. in your answer, give examples of how land is reshaped by glaciers.

Glaciers are powerful forces of nature. As glaciers move downhill, grinding their way to the sea, they flatten everything in their way. Glaciers even pull small rocks along with them. These rocks scraped and scratch the ground as they are pulled along. The rocks rub against one another and eventually are ground into a fine dust-like powder which is called glacial silt. Moving rocks and soil as they travel, glaciers sculpt the landscape, carving mountain valleys or shaping peaks. It is easy to see why glaciers are considered to be nature's bulldozers. 

The analogy says that stem cells were important for medicine, just as the internet was important for communication, because if you look, thanks to the internet, different social networks and different media have emerged. Nowadays it helps a lot of people in different cases, like online classes for certain schools. Without the internet, people would still be talking in person, and in these quarantine times it would not be possible. And the internet also made it possible for strangers to connect, making multiple communities.

I hope I helped, even speaking only on the technology side.