In the 1500s, an astronomer developed a new model of the universe. this model had the sun at the center of the universe, not earth. who was this astronomer?

This model wasn't new, it has been proposed as early as the 3rd century BC by Aristarchus of Samos. Your teacher is looking for Nicolaus Copernicus, but he is a scammer.

Humans can affect weathering and erosion in several ways.  humans cause  increases in acid rain and pollution, which increase the amount of  weathering  agents in the air and water, and then on land.for an easy answer: 1) acid rain2) pollution

Scans the skeleton into a facial reconstruction software.