What was one clue that the iceman was from neolithic age?

A. cave drawings

B. the wear of his teeth

C. feathers

D. his copper ax

D. his copper ax

Explanation:

The neolithic age has as characteristic the fact that humans started to develop agriculture, and chaged entirely the way that society was organized, this allowed them to start to be more sedentary, by the end of this era the usage of copper was introduced, and this gave a strong clue on the time that Ozi was form the neolithic age.