1. What challenges do High -Altitude Archaeologists face? ​

Nevertheless, despite recent advances in practice, archaeological sites face increasing challenges from development, climate change, tourism, insufficient management, looting, conflict, and inadequate governmental resources.

I'm not sure if it's correct, but I'm guessing it's that.

Shops, saloons, brothels and other businesses set up in these towns to serve the '49ers and make money of their own. San Francisco became the center of the booming new economy. People also became wealthy by providing the miners with over-priced food, supplies and services. They also sold expensive, durable shovels.

Explanation: