One difference between the technology of the Plano and that of the Clovis and the Folsom is that the Plano hunted bison using stone weapons. perfected a single type of stone point. made clothing from animal hides. developed a variety of stone points.

Option:  developed a variety of stone points.

Explanation:

Paleo Indians were the first people who lived in North America. They arrive from Siberia through passing the Bering Land Bridge. They killed animals for food and survival in the cold and wild environment. They also gathered roots, berries, wild plants, nuts for food. Plano, Clovis, and Folsom are three different Paleo-Indian cultures. Plano culture found in Colorado.  The Plano developed a variety of spears with sharp points made of stone to hunt animals.

in 1897, pershing became a tactical officer at west point, and that's where he was given the nickname "black jack." pershing's first name is "john," for which "jack" is a nickname, and he was a white man who commanded black troops. hence "black jack".